23213221231 has 4 divisors (see below), whose sum is σ = 23245152112. Its totient is φ = 23181290352.

The previous prime is 23213221147. The next prime is 23213221243. The reversal of 23213221231 is 13212231232.

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 23213221231 - 2⁷ = 23213221103 is a prime.

It is a super-2 number, since 2×23213221231² (a number of 22 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 (23213221331) 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, 15964350 + ... + 15965803.

It is an arithmetic number, because the mean of its divisors is an integer number (5811288028).

Almost surely, 2^23213221231 is an apocalyptic number.

23213221231 is a deficient number, since it is larger than the sum of its proper divisors (31930881).

23213221231 is an equidigital number, since it uses as much as digits as its factorization.

23213221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31930880.

The product of its digits is 864, while the sum is 22.

Adding to 23213221231 its reverse (13212231232), we get a palindrome (36425452463).

The spelling of 23213221231 in words is "twenty-three billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred thirty-one".