21237252364 has 24 divisors (see below), whose sum is σ = 37317490560. Its totient is φ = 10575189504.

The previous prime is 21237252359. The next prime is 21237252371. The reversal of 21237252364 is 46325273212.

It is a super-3 number, since 3×21237252364³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161477 + ... + 1179619.

It is an arithmetic number, because the mean of its divisors is an integer number (1554895440).

Almost surely, 2^21237252364 is an apocalyptic number.

It is an amenable number.

21237252364 is a deficient number, since it is larger than the sum of its proper divisors (16080238196).

21237252364 is a wasteful number, since it uses less digits than its factorization.

21237252364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19329 (or 19327 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The spelling of 21237252364 in words is "twenty-one billion, two hundred thirty-seven million, two hundred fifty-two thousand, three hundred sixty-four".