113212421 has 12 divisors (see below), whose sum is σ = 132479712. Its totient is φ = 94771656.

The previous prime is 113212387. The next prime is 113212441. The reversal of 113212421 is 124212311.

It is a de Polignac number, because none of the positive numbers 2^k-113212421 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 113212421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113212441) 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, 8570 + ... + 17316.

It is an arithmetic number, because the mean of its divisors is an integer number (11039976).

Almost surely, 2^113212421 is an apocalyptic number.

It is an amenable number.

113212421 is a deficient number, since it is larger than the sum of its proper divisors (19267291).

113212421 is an frugal number, since it uses more digits than its factorization.

113212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840 (or 8797 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 113212421 is about 10640.1325649637. The cubic root of 113212421 is about 483.7615635096.

Adding to 113212421 its reverse (124212311), we get a palindrome (237424732).

The spelling of 113212421 in words is "one hundred thirteen million, two hundred twelve thousand, four hundred twenty-one".