19597921044 has 24 divisors (see below), whose sum is σ = 49246058400. Its totient is φ = 6030129504.

The previous prime is 19597921009. The next prime is 19597921139. The reversal of 19597921044 is 44012979591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62813694 + ... + 62814005.

It is an arithmetic number, because the mean of its divisors is an integer number (2051919100).

Almost surely, 2^19597921044 is an apocalyptic number.

It is an amenable number.

19597921044 is an abundant number, since it is smaller than the sum of its proper divisors (29648137356).

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

19597921044 is a wasteful number, since it uses less digits than its factorization.

19597921044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125627719 (or 125627717 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 19597921044 in words is "nineteen billion, five hundred ninety-seven million, nine hundred twenty-one thousand, forty-four".