131929000021 has 32 divisors (see below), whose sum is σ = 171965541888. Its totient is φ = 98220349440.

The previous prime is 131928999989. The next prime is 131929000033. The reversal of 131929000021 is 120000929131.

It is a cyclic number.

It is not a de Polignac number, because 131929000021 - 2⁵ = 131928999989 is a prime.

It is a super-2 number, since 2×131929000021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131929000081) 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, 9756361 + ... + 9769873.

It is an arithmetic number, because the mean of its divisors is an integer number (5373923184).

Almost surely, 2^131929000021 is an apocalyptic number.

131929000021 is the 229721-st heptagonal number.

It is an amenable number.

131929000021 is a deficient number, since it is larger than the sum of its proper divisors (40036541867).

131929000021 is a wasteful number, since it uses less digits than its factorization.

131929000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19861.

The product of its (nonzero) digits is 972, while the sum is 28.

Adding to 131929000021 its reverse (120000929131), we get a palindrome (251929929152).

The spelling of 131929000021 in words is "one hundred thirty-one billion, nine hundred twenty-nine million, twenty-one", and thus it is an aban number.