113231011221 has 24 divisors (see below), whose sum is σ = 169203991320. Its totient is φ = 72916992000.

The previous prime is 113231011219. The next prime is 113231011247. The reversal of 113231011221 is 122110132311.

113231011221 is a `hidden beast` number, since 1 + 132 + 310 + 1 + 1 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 51173226225 + 62057784996 = 226215^2 + 249114^2 .

It is not a de Polignac number, because 113231011221 - 2¹ = 113231011219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113231011194 and 113231011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113231011021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1481836 + ... + 1556373.

It is an arithmetic number, because the mean of its divisors is an integer number (7050166305).

Almost surely, 2^113231011221 is an apocalyptic number.

It is an amenable number.

113231011221 is a deficient number, since it is larger than the sum of its proper divisors (55972980099).

113231011221 is a wasteful number, since it uses less digits than its factorization.

113231011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3038357 (or 3038354 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 113231011221 its reverse (122110132311), we get a palindrome (235341143532).

The spelling of 113231011221 in words is "one hundred thirteen billion, two hundred thirty-one million, eleven thousand, two hundred twenty-one".