131231000220121 has 32 divisors (see below), whose sum is σ = 139344236933760. Its totient is φ = 123431207961600.

The previous prime is 131231000220119. The next prime is 131231000220143. The reversal of 131231000220121 is 121022000132131.

It is not a de Polignac number, because 131231000220121 - 2¹ = 131231000220119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131231000220521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 536125041 + ... + 536369761.

It is an arithmetic number, because the mean of its divisors is an integer number (4354507404180).

Almost surely, 2^{131231000220121} is an apocalyptic number.

It is an amenable number.

131231000220121 is a deficient number, since it is larger than the sum of its proper divisors (8113236713639).

131231000220121 is a wasteful number, since it uses less digits than its factorization.

131231000220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248905.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131231000220121 its reverse (121022000132131), we get a palindrome (252253000352252).

The spelling of 131231000220121 in words is "one hundred thirty-one trillion, two hundred thirty-one billion, two hundred twenty thousand, one hundred twenty-one".