21275113 has 4 divisors (see below), whose sum is σ = 21592720. Its totient is φ = 20957508.

The previous prime is 21275099. The next prime is 21275123. The reversal of 21275113 is 31157212.

It is a happy number.

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 21275113 - 2⁵ = 21275081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158703 + ... + 158836.

It is an arithmetic number, because the mean of its divisors is an integer number (5398180).

Almost surely, 2^21275113 is an apocalyptic number.

It is an amenable number.

21275113 is a deficient number, since it is larger than the sum of its proper divisors (317607).

21275113 is an equidigital number, since it uses as much as digits as its factorization.

21275113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317606.

The product of its digits is 420, while the sum is 22.

The square root of 21275113 is about 4612.4953116507. The cubic root of 21275113 is about 277.0919815995.

The spelling of 21275113 in words is "twenty-one million, two hundred seventy-five thousand, one hundred thirteen".