19621974972 has 12 divisors (see below), whose sum is σ = 45784608296. Its totient is φ = 6540658320.

The previous prime is 19621974961. The next prime is 19621974989. The reversal of 19621974972 is 27947912691.

It is a tau number, because it is divible by the number of its divisors (12).

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, 817582279 + ... + 817582302.

Almost surely, 2^19621974972 is an apocalyptic number.

19621974972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19621974972 is an abundant number, since it is smaller than the sum of its proper divisors (26162633324).

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

19621974972 is a wasteful number, since it uses less digits than its factorization.

19621974972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635164588 (or 1635164586 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 57.

The spelling of 19621974972 in words is "nineteen billion, six hundred twenty-one million, nine hundred seventy-four thousand, nine hundred seventy-two".