21316759 has 16 divisors (see below), whose sum is σ = 23444640. Its totient is φ = 19302400.

The previous prime is 21316753. The next prime is 21316783. The reversal of 21316759 is 95761312.

It is a cyclic number.

It is not a de Polignac number, because 21316759 - 2³ = 21316751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21316751) 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 15 ways as a sum of consecutive naturals, for example, 52959 + ... + 53359.

It is an arithmetic number, because the mean of its divisors is an integer number (1465290).

Almost surely, 2^21316759 is an apocalyptic number.

21316759 is a deficient number, since it is larger than the sum of its proper divisors (2127881).

21316759 is a wasteful number, since it uses less digits than its factorization.

21316759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its digits is 11340, while the sum is 34.

The square root of 21316759 is about 4617.0075806739. The cubic root of 21316759 is about 277.2726661259.

The spelling of 21316759 in words is "twenty-one million, three hundred sixteen thousand, seven hundred fifty-nine".