19921474326 has 16 divisors (see below), whose sum is σ = 42907791024. Its totient is φ = 6129684384.

The previous prime is 19921474303. The next prime is 19921474333. The reversal of 19921474326 is 62347412991.

It is a Curzon number.

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, 127701681 + ... + 127701836.

It is an arithmetic number, because the mean of its divisors is an integer number (2681736939).

Almost surely, 2^19921474326 is an apocalyptic number.

19921474326 is an abundant number, since it is smaller than the sum of its proper divisors (22986316698).

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

19921474326 is a wasteful number, since it uses less digits than its factorization.

19921474326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255403535.

The product of its digits is 653184, while the sum is 48.

The spelling of 19921474326 in words is "nineteen billion, nine hundred twenty-one million, four hundred seventy-four thousand, three hundred twenty-six".