231222021213 has 16 divisors (see below), whose sum is σ = 316565669952. Its totient is φ = 150031056000.

The previous prime is 231222021179. The next prime is 231222021221. The reversal of 231222021213 is 312120222132.

It is not a de Polignac number, because 231222021213 - 2⁸ = 231222020957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231222021213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231222021253) 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, 2180823 + ... + 2284388.

It is an arithmetic number, because the mean of its divisors is an integer number (19785354372).

Almost surely, 2^231222021213 is an apocalyptic number.

It is an amenable number.

231222021213 is a deficient number, since it is larger than the sum of its proper divisors (85343648739).

231222021213 is a wasteful number, since it uses less digits than its factorization.

231222021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465676.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 231222021213 its reverse (312120222132), we get a palindrome (543342243345).

The spelling of 231222021213 in words is "two hundred thirty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred thirteen".