21668502152 has 16 divisors (see below), whose sum is σ = 44321936400. Its totient is φ = 9849319120.

The previous prime is 21668502143. The next prime is 21668502187. The reversal of 21668502152 is 25120586612.

It is a super-2 number, since 2×21668502152² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123116402 + ... + 123116577.

It is an arithmetic number, because the mean of its divisors is an integer number (2770121025).

Almost surely, 2^21668502152 is an apocalyptic number.

21668502152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21668502152 is an abundant number, since it is smaller than the sum of its proper divisors (22653434248).

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

21668502152 is a wasteful number, since it uses less digits than its factorization.

21668502152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246232996 (or 246232992 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 21668502152 in words is "twenty-one billion, six hundred sixty-eight million, five hundred two thousand, one hundred fifty-two".