21065902372 has 12 divisors (see below), whose sum is σ = 37223245696. Its totient is φ = 10430689320.

The previous prime is 21065902367. The next prime is 21065902373. The reversal of 21065902372 is 27320956012.

It is not an unprimeable number, because it can be changed into a prime (21065902373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25565004 + ... + 25565827.

Almost surely, 2^21065902372 is an apocalyptic number.

It is an amenable number.

21065902372 is a deficient number, since it is larger than the sum of its proper divisors (16157343324).

21065902372 is a wasteful number, since it uses less digits than its factorization.

21065902372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51130938 (or 51130936 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21065902372 in words is "twenty-one billion, sixty-five million, nine hundred two thousand, three hundred seventy-two".