21204807083231 has 4 divisors (see below), whose sum is σ = 21402982850472. Its totient is φ = 21006631315992.

The previous prime is 21204807083179. The next prime is 21204807083263. The reversal of 21204807083231 is 13238070840212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21204807083231 - 2⁶ = 21204807083167 is a prime.

It is a super-2 number, since 2×21204807083231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204807083731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99087883460 + ... + 99087883673.

It is an arithmetic number, because the mean of its divisors is an integer number (5350745712618).

Almost surely, 2^{21204807083231} is an apocalyptic number.

21204807083231 is a deficient number, since it is larger than the sum of its proper divisors (198175767241).

21204807083231 is a wasteful number, since it uses less digits than its factorization.

21204807083231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198175767240.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 21204807083231 in words is "twenty-one trillion, two hundred four billion, eight hundred seven million, eighty-three thousand, two hundred thirty-one".