113431331221 has 12 divisors (see below), whose sum is σ = 122977767780. Its totient is φ = 104578181760.

The previous prime is 113431331201. The next prime is 113431331239. The reversal of 113431331221 is 122133134311.

It can be written as a sum of positive squares in 6 ways, for example, as 14187430321 + 99243900900 = 119111^2 + 315030^2 .

It is not a de Polignac number, because 113431331221 - 2¹⁹ = 113430806933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113431331201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270016 + ... + 547513.

It is an arithmetic number, because the mean of its divisors is an integer number (10248147315).

Almost surely, 2^113431331221 is an apocalyptic number.

It is an amenable number.

113431331221 is a deficient number, since it is larger than the sum of its proper divisors (9546436559).

113431331221 is an equidigital number, since it uses as much as digits as its factorization.

113431331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818376 (or 818363 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

Adding to 113431331221 its reverse (122133134311), we get a palindrome (235564465532).

The spelling of 113431331221 in words is "one hundred thirteen billion, four hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-one".