| Base | Representation |
|---|---|
| bin | 1001100110101101010100… |
| … | …01110000111100101001100 |
| 3 | 2202210011112102221001002000 |
| 4 | 10303112222032013211030 |
| 5 | 10232022214231202340 |
| 6 | 112530541104032300 |
| 7 | 4306646162662620 |
| oct | 463265216074514 |
| 9 | 82704472831060 |
| 10 | 21121210022220 |
| 11 | 6803500479710 |
| 12 | 2451522602690 |
| 13 | ba294c359ac9 |
| 14 | 5303b45c9180 |
| 15 | 26962791cd30 |
| hex | 1335aa38794c |
21121210022220 has 1152 divisors, whose sum is σ = 83654000640000. Its totient is φ = 4297958184960.
The previous prime is 21121210022197. The next prime is 21121210022249. The reversal of 21121210022220 is 2222001212112.
It is a happy number.
21121210022220 is a `hidden beast` number, since 211 + 2 + 1 + 210 + 0 + 22 + 220 = 666.
It is a super-2 number, since 2×211212100222202 (a number of 27 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 21121210022193 and 21121210022202.
It is an unprimeable number.
It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 44094383941 + ... + 44094384419.
It is an arithmetic number, because the mean of its divisors is an integer number (72616320000).
Almost surely, 221121210022220 is an apocalyptic number.
21121210022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21121210022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41827000320000).
21121210022220 is an abundant number, since it is smaller than the sum of its proper divisors (62532790617780).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21121210022220 is a wasteful number, since it uses less digits than its factorization.
21121210022220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 860 (or 779 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 18.
Adding to 21121210022220 its reverse (2222001212112), we get a palindrome (23343211234332).
The spelling of 21121210022220 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, twenty-two thousand, two hundred twenty".
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