21736713 has 4 divisors (see below), whose sum is σ = 28982288. Its totient is φ = 14491140.

The previous prime is 21736711. The next prime is 21736753. The reversal of 21736713 is 31763712.

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 not a de Polignac number, because 21736713 - 2¹ = 21736711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21736711) 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, 3622783 + ... + 3622788.

It is an arithmetic number, because the mean of its divisors is an integer number (7245572).

Almost surely, 2^21736713 is an apocalyptic number.

It is an amenable number.

21736713 is a deficient number, since it is larger than the sum of its proper divisors (7245575).

21736713 is an equidigital number, since it uses as much as digits as its factorization.

21736713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7245574.

The product of its digits is 5292, while the sum is 30.

The square root of 21736713 is about 4662.2647929949. The cubic root of 21736713 is about 279.0816554201.

The spelling of 21736713 in words is "twenty-one million, seven hundred thirty-six thousand, seven hundred thirteen".