21264713 has 8 divisors (see below), whose sum is σ = 21974976. Its totient is φ = 20566000.

The previous prime is 21264709. The next prime is 21264769. The reversal of 21264713 is 31746212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21264713 - 2² = 21264709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264703) 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 7 ways as a sum of consecutive naturals, for example, 938 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (2746872).

Almost surely, 2^21264713 is an apocalyptic number.

It is an amenable number.

21264713 is a deficient number, since it is larger than the sum of its proper divisors (710263).

21264713 is an equidigital number, since it uses as much as digits as its factorization.

21264713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775.

The product of its digits is 2016, while the sum is 26.

The square root of 21264713 is about 4611.3678014229. The cubic root of 21264713 is about 277.0468235738.

The spelling of 21264713 in words is "twenty-one million, two hundred sixty-four thousand, seven hundred thirteen".