21900721088 has 28 divisors (see below), whose sum is σ = 43747072272. Its totient is φ = 10877836800.

The previous prime is 21900721069. The next prime is 21900721147. The reversal of 21900721088 is 88012700912.

It is a congruent number.

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, 1123445 + ... + 1142772.

Almost surely, 2^21900721088 is an apocalyptic number.

It is an amenable number.

21900721088 is a deficient number, since it is larger than the sum of its proper divisors (21846351184).

21900721088 is a wasteful number, since it uses less digits than its factorization.

21900721088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266380 (or 2266370 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 21900721088 in words is "twenty-one billion, nine hundred million, seven hundred twenty-one thousand, eighty-eight".