21431125872008 has 64 divisors (see below), whose sum is σ = 41038118035200. Its totient is φ = 10489393601280.

The previous prime is 21431125871929. The next prime is 21431125872011. The reversal of 21431125872008 is 80027852113412.

It is a super-2 number, since 2×21431125872008² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21431125872008.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129930053 + ... + 130094891.

It is an arithmetic number, because the mean of its divisors is an integer number (641220594300).

Almost surely, 2^{21431125872008} is an apocalyptic number.

It is an amenable number.

21431125872008 is a deficient number, since it is larger than the sum of its proper divisors (19606992163192).

21431125872008 is a wasteful number, since it uses less digits than its factorization.

21431125872008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166182 (or 166178 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 21431125872008 in words is "twenty-one trillion, four hundred thirty-one billion, one hundred twenty-five million, eight hundred seventy-two thousand, eight".