131221112031 has 96 divisors (see below), whose sum is σ = 208085806656. Its totient is φ = 79372800000.

The previous prime is 131221111969. The next prime is 131221112047. The reversal of 131221112031 is 130211122131.

It is not a de Polignac number, because 131221112031 - 2⁹ = 131221111519 is a prime.

It is a super-2 number, since 2×131221112031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131221111995 and 131221112013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221112431) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 100861081 + ... + 100862381.

It is an arithmetic number, because the mean of its divisors is an integer number (2167560486).

Almost surely, 2^131221112031 is an apocalyptic number.

131221112031 is a deficient number, since it is larger than the sum of its proper divisors (76864694625).

131221112031 is a wasteful number, since it uses less digits than its factorization.

131221112031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1590 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 131221112031 its reverse (130211122131), we get a palindrome (261432234162).

The spelling of 131221112031 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twelve thousand, thirty-one".