21900672392 has 32 divisors (see below), whose sum is σ = 43232700000. Its totient is φ = 10372157568.

The previous prime is 21900672389. The next prime is 21900672397. The reversal of 21900672392 is 29327600912.

It is a super-2 number, since 2×21900672392² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21900672397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257359 + ... + 1274657.

It is an arithmetic number, because the mean of its divisors is an integer number (1351021875).

Almost surely, 2^21900672392 is an apocalyptic number.

It is an amenable number.

21900672392 is a deficient number, since it is larger than the sum of its proper divisors (21332027608).

21900672392 is a wasteful number, since it uses less digits than its factorization.

21900672392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25653 (or 25649 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 21900672392 in words is "twenty-one billion, nine hundred million, six hundred seventy-two thousand, three hundred ninety-two".