21537051368 has 16 divisors (see below), whose sum is σ = 46150824480. Its totient is φ = 9230164848.

The previous prime is 21537051331. The next prime is 21537051407. The reversal of 21537051368 is 86315073512.

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, 192295046 + ... + 192295157.

It is an arithmetic number, because the mean of its divisors is an integer number (2884426530).

Almost surely, 2^21537051368 is an apocalyptic number.

21537051368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21537051368 is an abundant number, since it is smaller than the sum of its proper divisors (24613773112).

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

21537051368 is a wasteful number, since it uses less digits than its factorization.

21537051368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384590216 (or 384590212 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 21537051368 in words is "twenty-one billion, five hundred thirty-seven million, fifty-one thousand, three hundred sixty-eight".