21064713 has 4 divisors (see below), whose sum is σ = 28086288. Its totient is φ = 14043140.

The previous prime is 21064679. The next prime is 21064723. The reversal of 21064713 is 31746012.

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 21064713 - 2¹⁰ = 21063689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21064723) 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, 3510783 + ... + 3510788.

It is an arithmetic number, because the mean of its divisors is an integer number (7021572).

Almost surely, 2^21064713 is an apocalyptic number.

It is an amenable number.

21064713 is a deficient number, since it is larger than the sum of its proper divisors (7021575).

21064713 is an equidigital number, since it uses as much as digits as its factorization.

21064713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021574.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21064713 is about 4589.6310309218. The cubic root of 21064713 is about 276.1755210996.

The spelling of 21064713 in words is "twenty-one million, sixty-four thousand, seven hundred thirteen".