10131221992 has 16 divisors (see below), whose sum is σ = 18999188100. Its totient is φ = 5064771840.

The previous prime is 10131221981. The next prime is 10131222001. The reversal of 10131221992 is 29912213101.

It can be written as a sum of positive squares in 2 ways, for example, as 6628239396 + 3502982596 = 81414^2 + 59186^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52017 + ... + 151552.

Almost surely, 2^10131221992 is an apocalyptic number.

It is an amenable number.

10131221992 is a deficient number, since it is larger than the sum of its proper divisors (8867966108).

10131221992 is a wasteful number, since it uses less digits than its factorization.

10131221992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209796 (or 209792 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 10131221992 in words is "ten billion, one hundred thirty-one million, two hundred twenty-one thousand, nine hundred ninety-two".