21264313 has 8 divisors (see below), whose sum is σ = 24488640. Its totient is φ = 18086640.

The previous prime is 21264293. The next prime is 21264323. The reversal of 21264313 is 31346212.

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 21264313 - 2¹⁷ = 21133241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10678 + ... + 12511.

It is an arithmetic number, because the mean of its divisors is an integer number (3061080).

Almost surely, 2^21264313 is an apocalyptic number.

It is an amenable number.

21264313 is a deficient number, since it is larger than the sum of its proper divisors (3224327).

21264313 is a wasteful number, since it uses less digits than its factorization.

21264313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23327.

The product of its digits is 864, while the sum is 22.

The square root of 21264313 is about 4611.3244301393. The cubic root of 21264313 is about 277.0450864326.

The spelling of 21264313 in words is "twenty-one million, two hundred sixty-four thousand, three hundred thirteen".