23212131331 has 4 divisors (see below), whose sum is σ = 23451431752. Its totient is φ = 22972830912.

The previous prime is 23212131329. The next prime is 23212131343. The reversal of 23212131331 is 13313121232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23212131331 - 2¹ = 23212131329 is a prime.

It is a super-2 number, since 2×23212131331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23212131031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119650065 + ... + 119650258.

It is an arithmetic number, because the mean of its divisors is an integer number (5862857938).

Almost surely, 2^23212131331 is an apocalyptic number.

23212131331 is a deficient number, since it is larger than the sum of its proper divisors (239300421).

23212131331 is an equidigital number, since it uses as much as digits as its factorization.

23212131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239300420.

The product of its digits is 648, while the sum is 22.

Adding to 23212131331 its reverse (13313121232), we get a palindrome (36525252563).

The spelling of 23212131331 in words is "twenty-three billion, two hundred twelve million, one hundred thirty-one thousand, three hundred thirty-one".