232131312221 has 4 divisors (see below), whose sum is σ = 232139253600. Its totient is φ = 232123370844.

The previous prime is 232131312137. The next prime is 232131312223. The reversal of 232131312221 is 122213131232.

232131312221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 232131312221 - 2¹⁸ = 232131050077 is a prime.

It is a super-2 number, since 2×232131312221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232131312223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3926681 + ... + 3985358.

It is an arithmetic number, because the mean of its divisors is an integer number (58034813400).

Almost surely, 2^232131312221 is an apocalyptic number.

It is an amenable number.

232131312221 is a deficient number, since it is larger than the sum of its proper divisors (7941379).

232131312221 is an equidigital number, since it uses as much as digits as its factorization.

232131312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7941378.

The product of its digits is 864, while the sum is 23.

Adding to 232131312221 its reverse (122213131232), we get a palindrome (354344443453).

The spelling of 232131312221 in words is "two hundred thirty-two billion, one hundred thirty-one million, three hundred twelve thousand, two hundred twenty-one".