113639021 has 4 divisors (see below), whose sum is σ = 118579872. Its totient is φ = 108698172.

The previous prime is 113639011. The next prime is 113639047. The reversal of 113639021 is 120936311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 113639021 - 2¹⁴ = 113622637 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 (113639011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2470391 + ... + 2470436.

It is an arithmetic number, because the mean of its divisors is an integer number (29644968).

Almost surely, 2^113639021 is an apocalyptic number.

It is an amenable number.

113639021 is a deficient number, since it is larger than the sum of its proper divisors (4940851).

113639021 is an equidigital number, since it uses as much as digits as its factorization.

113639021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940850.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 113639021 is about 10660.1604584546. The cubic root of 113639021 is about 484.3684286365.

The spelling of 113639021 in words is "one hundred thirteen million, six hundred thirty-nine thousand, twenty-one".