21146113 has 4 divisors (see below), whose sum is σ = 22390020. Its totient is φ = 19902208.

The previous prime is 21146101. The next prime is 21146137. The reversal of 21146113 is 31164112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9809424 + 11336689 = 3132^2 + 3367^2 .

It is a cyclic number.

It is not a de Polignac number, because 21146113 - 2⁹ = 21145601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21146813) 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, 621928 + ... + 621961.

It is an arithmetic number, because the mean of its divisors is an integer number (5597505).

Almost surely, 2^21146113 is an apocalyptic number.

It is an amenable number.

21146113 is a deficient number, since it is larger than the sum of its proper divisors (1243907).

21146113 is a wasteful number, since it uses less digits than its factorization.

21146113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243906.

The product of its digits is 144, while the sum is 19.

The square root of 21146113 is about 4598.4902957384. The cubic root of 21146113 is about 276.5308039239.

The spelling of 21146113 in words is "twenty-one million, one hundred forty-six thousand, one hundred thirteen".