231213220113 has 16 divisors (see below), whose sum is σ = 316630737920. Its totient is φ = 149969304576.

The previous prime is 231213220099. The next prime is 231213220129. The reversal of 231213220113 is 311022312132.

It is not a de Polignac number, because 231213220113 - 2¹⁶ = 231213154577 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 231213220113.

It is not an unprimeable number, because it can be changed into a prime (231213220213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3784656 + ... + 3845262.

It is an arithmetic number, because the mean of its divisors is an integer number (19789421120).

Almost surely, 2^231213220113 is an apocalyptic number.

It is an amenable number.

231213220113 is a deficient number, since it is larger than the sum of its proper divisors (85417517807).

231213220113 is a wasteful number, since it uses less digits than its factorization.

231213220113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95016.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231213220113 its reverse (311022312132), we get a palindrome (542235532245).

The spelling of 231213220113 in words is "two hundred thirty-one billion, two hundred thirteen million, two hundred twenty thousand, one hundred thirteen".