19721966832 has 100 divisors (see below), whose sum is σ = 60438872736. Its totient is φ = 6187276800.

The previous prime is 19721966827. The next prime is 19721966843. The reversal of 19721966832 is 23866912791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 425544 + ... + 469607.

Almost surely, 2^19721966832 is an apocalyptic number.

19721966832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19721966832 is an abundant number, since it is smaller than the sum of its proper divisors (40716905904).

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

19721966832 is a wasteful number, since it uses less digits than its factorization.

19721966832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895188 (or 895173 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 19721966832 in words is "nineteen billion, seven hundred twenty-one million, nine hundred sixty-six thousand, eight hundred thirty-two".