| Base | Representation |
|---|---|
| bin | 1001100110101101010100… |
| … | …01110000111010100000000 |
| 3 | 2202210011112102220222120021 |
| 4 | 10303112222032013110000 |
| 5 | 10232022214231133440 |
| 6 | 112530541104023224 |
| 7 | 4306646162656456 |
| oct | 463265216072400 |
| 9 | 82704472828507 |
| 10 | 21121210021120 |
| 11 | 6803500478900 |
| 12 | 2451522601b14 |
| 13 | ba294c359461 |
| 14 | 5303b45c89d6 |
| 15 | 26962791c84a |
| hex | 1335aa387500 |
21121210021120 has 216 divisors, whose sum is σ = 57403137415680. Its totient is φ = 7432682188800.
The previous prime is 21121210021111. The next prime is 21121210021123. The reversal of 21121210021120 is 2112001212112.
It is a super-2 number, since 2×211212100211202 (a number of 27 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (16).
It is a junction number, because it is equal to n+sod(n) for n = 21121210021094 and 21121210021103.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21121210021123) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2601741 + ... + 7000819.
Almost surely, 221121210021120 is an apocalyptic number.
21121210021120 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 21121210021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28701568707840).
21121210021120 is an abundant number, since it is smaller than the sum of its proper divisors (36281927394560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21121210021120 is a wasteful number, since it uses less digits than its factorization.
21121210021120 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4399153 (or 4399128 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 16.
Adding to 21121210021120 its reverse (2112001212112), we get a palindrome (23233211233232).
The spelling of 21121210021120 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, twenty-one thousand, one hundred twenty".
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