113212231221 has 32 divisors (see below), whose sum is σ = 164434803840. Its totient is φ = 68994809856.

The previous prime is 113212231199. The next prime is 113212231261. The reversal of 113212231221 is 122132212311.

It is a de Polignac number, because none of the positive numbers 2^k-113212231221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113212231261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1036810 + ... + 1140788.

It is an arithmetic number, because the mean of its divisors is an integer number (5138587620).

Almost surely, 2^113212231221 is an apocalyptic number.

It is an amenable number.

113212231221 is a deficient number, since it is larger than the sum of its proper divisors (51222572619).

113212231221 is a wasteful number, since it uses less digits than its factorization.

113212231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104613.

The product of its digits is 288, while the sum is 21.

Adding to 113212231221 its reverse (122132212311), we get a palindrome (235344443532).

The spelling of 113212231221 in words is "one hundred thirteen billion, two hundred twelve million, two hundred thirty-one thousand, two hundred twenty-one".