131231213321021 has 32 divisors (see below), whose sum is σ = 149269369466880. Its totient is φ = 114276210048000.

The previous prime is 131231213320981. The next prime is 131231213321113. The reversal of 131231213321021 is 120123312132131.

It is not a de Polignac number, because 131231213321021 - 2²⁶ = 131231146212157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231213321321) 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, 1941227621 + ... + 1941295221.

It is an arithmetic number, because the mean of its divisors is an integer number (4664667795840).

Almost surely, 2^{131231213321021} is an apocalyptic number.

131231213321021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131231213321021 is a deficient number, since it is larger than the sum of its proper divisors (18038156145859).

131231213321021 is a wasteful number, since it uses less digits than its factorization.

131231213321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115685.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 131231213321021 its reverse (120123312132131), we get a palindrome (251354525453152).

The spelling of 131231213321021 in words is "one hundred thirty-one trillion, two hundred thirty-one billion, two hundred thirteen million, three hundred twenty-one thousand, twenty-one".