23213031231 has 16 divisors (see below), whose sum is σ = 33358721760. Its totient is φ = 14273289600.

The previous prime is 23213031227. The next prime is 23213031239. The reversal of 23213031231 is 13213031232.

It is not a de Polignac number, because 23213031231 - 2² = 23213031227 is a prime.

It is a super-2 number, since 2×23213031231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23213031198 and 23213031207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213031239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194220 + ... + 290081.

It is an arithmetic number, because the mean of its divisors is an integer number (2084920110).

Almost surely, 2^23213031231 is an apocalyptic number.

23213031231 is a deficient number, since it is larger than the sum of its proper divisors (10145690529).

23213031231 is a wasteful number, since it uses less digits than its factorization.

23213031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485546.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 23213031231 its reverse (13213031232), we get a palindrome (36426062463).

Subtracting from 23213031231 its reverse (13213031232), we obtain a palindrome (9999999999).

The spelling of 23213031231 in words is "twenty-three billion, two hundred thirteen million, thirty-one thousand, two hundred thirty-one".