21268713 has 4 divisors (see below), whose sum is σ = 28358288. Its totient is φ = 14179140.

The previous prime is 21268699. The next prime is 21268727. The reversal of 21268713 is 31786212.

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 an interprime number because it is at equal distance from previous prime (21268699) and next prime (21268727).

It is not a de Polignac number, because 21268713 - 2¹⁰ = 21267689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21268763) 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, 3544783 + ... + 3544788.

It is an arithmetic number, because the mean of its divisors is an integer number (7089572).

Almost surely, 2^21268713 is an apocalyptic number.

It is an amenable number.

21268713 is a deficient number, since it is larger than the sum of its proper divisors (7089575).

21268713 is an equidigital number, since it uses as much as digits as its factorization.

21268713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7089574.

The product of its digits is 4032, while the sum is 30.

The square root of 21268713 is about 4611.8014918251. The cubic root of 21268713 is about 277.0641937873.

The spelling of 21268713 in words is "twenty-one million, two hundred sixty-eight thousand, seven hundred thirteen".