113031131221 has 2 divisors, whose sum is σ = 113031131222. Its totient is φ = 113031131220.

The previous prime is 113031131179. The next prime is 113031131261. The reversal of 113031131221 is 122131130311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101729102500 + 11302028721 = 318950^2 + 106311^2 .

It is a cyclic number.

It is not a de Polignac number, because 113031131221 - 2¹⁷ = 113031000149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113031131261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56515565610 + 56515565611.

It is an arithmetic number, because the mean of its divisors is an integer number (56515565611).

Almost surely, 2^113031131221 is an apocalyptic number.

It is an amenable number.

113031131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113031131221 is an equidigital number, since it uses as much as digits as its factorization.

113031131221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 113031131221 its reverse (122131130311), we get a palindrome (235162261532).

The spelling of 113031131221 in words is "one hundred thirteen billion, thirty-one million, one hundred thirty-one thousand, two hundred twenty-one".