21602021168 has 80 divisors (see below), whose sum is σ = 52385813760. Its totient is φ = 8400976128.

The previous prime is 21602021167. The next prime is 21602021173. The reversal of 21602021168 is 86112020612.

It is a self number, because there is not a number n which added to its sum of digits gives 21602021168.

It is not an unprimeable number, because it can be changed into a prime (21602021167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39830 + ... + 211637.

It is an arithmetic number, because the mean of its divisors is an integer number (654822672).

Almost surely, 2^21602021168 is an apocalyptic number.

21602021168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21602021168 is an abundant number, since it is smaller than the sum of its proper divisors (30783792592).

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

21602021168 is a wasteful number, since it uses less digits than its factorization.

21602021168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251554 (or 251548 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21602021168 in words is "twenty-one billion, six hundred two million, twenty-one thousand, one hundred sixty-eight".