21262085579 has 16 divisors (see below), whose sum is σ = 24455934720. Its totient is φ = 18107512800.

The previous prime is 21262085543. The next prime is 21262085591. The reversal of 21262085579 is 97558026212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21262085579 - 2⁸ = 21262085323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21262085479) 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, 1623632 + ... + 1636674.

It is an arithmetic number, because the mean of its divisors is an integer number (1528495920).

Almost surely, 2^21262085579 is an apocalyptic number.

21262085579 is a deficient number, since it is larger than the sum of its proper divisors (3193849141).

21262085579 is a wasteful number, since it uses less digits than its factorization.

21262085579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14530.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 21262085579 in words is "twenty-one billion, two hundred sixty-two million, eighty-five thousand, five hundred seventy-nine".