21316758 has 8 divisors (see below), whose sum is σ = 42633528. Its totient is φ = 7105584.

The previous prime is 21316753. The next prime is 21316783. The reversal of 21316758 is 85761312.

It is a sphenic number, since it is the product of 3 distinct primes.

21316758 is an admirable 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1776391 + ... + 1776402.

It is an arithmetic number, because the mean of its divisors is an integer number (5329191).

Almost surely, 2^21316758 is an apocalyptic number.

21316758 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21316758 is a wasteful number, since it uses less digits than its factorization.

21316758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552798.

The product of its digits is 10080, while the sum is 33.

The square root of 21316758 is about 4617.0074723786. The cubic root of 21316758 is about 277.2726617902.

The spelling of 21316758 in words is "twenty-one million, three hundred sixteen thousand, seven hundred fifty-eight".