Base | Representation |
---|---|
bin | 10100001001111001… |
… | …101001110011100000 |
3 | 2001212012020220102110 |
4 | 110021321221303200 |
5 | 323310040213424 |
6 | 13535224315320 |
7 | 1364165665500 |
oct | 241171516340 |
9 | 61765226373 |
10 | 21640944864 |
11 | 91a5827200 |
12 | 423b612b40 |
13 | 206b648326 |
14 | 10941d7a00 |
15 | 869d56c29 |
hex | 509e69ce0 |
21640944864 has 432 divisors, whose sum is σ = 73382745744. Its totient is φ = 5563514880.
The previous prime is 21640944863. The next prime is 21640944877. The reversal of 21640944864 is 46844904612.
It is a Harshad number since it is a multiple of its sum of digits (48).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21640944863) by changing a digit.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 109852414 + ... + 109852610.
It is an arithmetic number, because the mean of its divisors is an integer number (169867467).
Almost surely, 221640944864 is an apocalyptic number.
21640944864 is a gapful number since it is divisible by the number (24) 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 21640944864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36691372872).
21640944864 is an abundant number, since it is smaller than the sum of its proper divisors (51741800880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21640944864 is a wasteful number, since it uses less digits than its factorization.
21640944864 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 439 (or 413 counting only the distinct ones).
The product of its (nonzero) digits is 1327104, while the sum is 48.
The spelling of 21640944864 in words is "twenty-one billion, six hundred forty million, nine hundred forty-four thousand, eight hundred sixty-four".
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