| Base | Representation |
|---|---|
| bin | 10011111100101111… |
| … | …111101111110001100 |
| 3 | 2001021211002002121200 |
| 4 | 103330233331332030 |
| 5 | 322332044132340 |
| 6 | 13501303225500 |
| 7 | 1355546364462 |
| oct | 237457757614 |
| 9 | 61254062550 |
| 10 | 21420302220 |
| 11 | 90a2225109 |
| 12 | 4199748290 |
| 13 | 2034a14255 |
| 14 | 1072ba0832 |
| 15 | 8557c1330 |
| hex | 4fcbfdf8c |
21420302220 has 144 divisors (see below), whose sum is σ = 65506371840. Its totient is φ = 5665564800.
The previous prime is 21420302203. The next prime is 21420302237. The reversal of 21420302220 is 2220302412.
21420302220 is a `hidden beast` number, since 2 + 142 + 0 + 302 + 220 = 666.
It is an interprime number because it is at equal distance from previous prime (21420302203) and next prime (21420302237).
It is a super-2 number, since 2×214203022202 (a number of 21 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 = 21420302193 and 21420302202.
It is an unprimeable number.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13634035 + ... + 13635605.
It is an arithmetic number, because the mean of its divisors is an integer number (454905360).
Almost surely, 221420302220 is an apocalyptic number.
21420302220 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 21420302220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32753185920).
21420302220 is an abundant number, since it is smaller than the sum of its proper divisors (44086069620).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21420302220 is a wasteful number, since it uses less digits than its factorization.
21420302220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2156 (or 2151 counting only the distinct ones).
The product of its (nonzero) digits is 384, while the sum is 18.
Adding to 21420302220 its reverse (2220302412), we get a palindrome (23640604632).
The spelling of 21420302220 in words is "twenty-one billion, four hundred twenty million, three hundred two thousand, two hundred twenty".
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