21916675 has 12 divisors (see below), whose sum is σ = 29647656. Its totient is φ = 15939200.

The previous prime is 21916669. The next prime is 21916753. The reversal of 21916675 is 57661912.

It is not a de Polignac number, because 21916675 - 2¹³ = 21908483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 39574 + ... + 40123.

It is an arithmetic number, because the mean of its divisors is an integer number (2470638).

Almost surely, 2^21916675 is an apocalyptic number.

21916675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21916675 is a deficient number, since it is larger than the sum of its proper divisors (7730981).

21916675 is a wasteful number, since it uses less digits than its factorization.

21916675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79718 (or 79713 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 21916675 is about 4681.5248584195. The cubic root of 21916675 is about 279.8497280391.

The spelling of 21916675 in words is "twenty-one million, nine hundred sixteen thousand, six hundred seventy-five".