22021999972 has 12 divisors (see below), whose sum is σ = 44044000000. Its totient is φ = 9437999976.

The previous prime is 22021999963. The next prime is 22022000017. The reversal of 22021999972 is 27999912022.

22021999972 is an admirable 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, 393249972 + ... + 393250027.

Almost surely, 2^22021999972 is an apocalyptic number.

It is an amenable number.

22021999972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22021999972 is a wasteful number, since it uses less digits than its factorization.

22021999972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786500010 (or 786500008 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 22021999972 in words is "twenty-two billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-two".