21372138758 has 32 divisors (see below), whose sum is σ = 33755356800. Its totient is φ = 10134843264.

The previous prime is 21372138751. The next prime is 21372138797. The reversal of 21372138758 is 85783127312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372138751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890816 + ... + 914492.

It is an arithmetic number, because the mean of its divisors is an integer number (1054854900).

Almost surely, 2^21372138758 is an apocalyptic number.

21372138758 is a deficient number, since it is larger than the sum of its proper divisors (12383218042).

21372138758 is a wasteful number, since it uses less digits than its factorization.

21372138758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23984.

The product of its digits is 564480, while the sum is 47.

The spelling of 21372138758 in words is "twenty-one billion, three hundred seventy-two million, one hundred thirty-eight thousand, seven hundred fifty-eight".