23311231021 has 4 divisors (see below), whose sum is σ = 25104402652. Its totient is φ = 21518059392.

The previous prime is 23311231001. The next prime is 23311231087. The reversal of 23311231021 is 12013211332.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13856585796 + 9454645225 = 117714^2 + 97235^2 .

It is a cyclic number.

It is not a de Polignac number, because 23311231021 - 2⁵ = 23311230989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23311231021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311231001) 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, 896585796 + ... + 896585821.

It is an arithmetic number, because the mean of its divisors is an integer number (6276100663).

Almost surely, 2^23311231021 is an apocalyptic number.

It is an amenable number.

23311231021 is a deficient number, since it is larger than the sum of its proper divisors (1793171631).

23311231021 is a wasteful number, since it uses less digits than its factorization.

23311231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793171630.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 23311231021 its reverse (12013211332), we get a palindrome (35324442353).

The spelling of 23311231021 in words is "twenty-three billion, three hundred eleven million, two hundred thirty-one thousand, twenty-one".