21692713 has 4 divisors (see below), whose sum is σ = 24791680. Its totient is φ = 18593748.

The previous prime is 21692681. The next prime is 21692729. The reversal of 21692713 is 31729612.

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 21692713 - 2⁵ = 21692681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21692773) 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, 1549473 + ... + 1549486.

It is an arithmetic number, because the mean of its divisors is an integer number (6197920).

Almost surely, 2^21692713 is an apocalyptic number.

It is an amenable number.

21692713 is a deficient number, since it is larger than the sum of its proper divisors (3098967).

21692713 is an equidigital number, since it uses as much as digits as its factorization.

21692713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098966.

The product of its digits is 4536, while the sum is 31.

The square root of 21692713 is about 4657.5436659252. The cubic root of 21692713 is about 278.8932201873.

It can be divided in two parts, 216 and 92713, that added together give a palindrome (92929).

The spelling of 21692713 in words is "twenty-one million, six hundred ninety-two thousand, seven hundred thirteen".