21602919264 has 48 divisors (see below), whose sum is σ = 56718724608. Its totient is φ = 7199568512.

The previous prime is 21602919263. The next prime is 21602919313. The reversal of 21602919264 is 46291920612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21602919264² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602919263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550009 + ... + 587975.

It is an arithmetic number, because the mean of its divisors is an integer number (1181640096).

Almost surely, 2^21602919264 is an apocalyptic number.

21602919264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21602919264 is an abundant number, since it is smaller than the sum of its proper divisors (35115805344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21602919264 is a wasteful number, since it uses less digits than its factorization.

21602919264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43907 (or 43899 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 21602919264 in words is "twenty-one billion, six hundred two million, nine hundred nineteen thousand, two hundred sixty-four".