21579411836 has 6 divisors (see below), whose sum is σ = 37763970720. Its totient is φ = 10789705916.

The previous prime is 21579411817. The next prime is 21579411851. The reversal of 21579411836 is 63811497512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2697426476 + ... + 2697426483.

It is an arithmetic number, because the mean of its divisors is an integer number (6293995120).

Almost surely, 2^21579411836 is an apocalyptic number.

It is an amenable number.

21579411836 is a deficient number, since it is larger than the sum of its proper divisors (16184558884).

21579411836 is a wasteful number, since it uses less digits than its factorization.

21579411836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394852963 (or 5394852961 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The spelling of 21579411836 in words is "twenty-one billion, five hundred seventy-nine million, four hundred eleven thousand, eight hundred thirty-six".