21874685 has 16 divisors (see below), whose sum is σ = 30968832. Its totient is φ = 14515200.

The previous prime is 21874673. The next prime is 21874691. The reversal of 21874685 is 58647812.

It is not a de Polignac number, because 21874685 - 2⁶ = 21874621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8996 + ... + 11165.

It is an arithmetic number, because the mean of its divisors is an integer number (1935552).

Almost surely, 2^21874685 is an apocalyptic number.

It is an amenable number.

21874685 is a deficient number, since it is larger than the sum of its proper divisors (9094147).

21874685 is a wasteful number, since it uses less digits than its factorization.

21874685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20204.

The product of its digits is 107520, while the sum is 41.

The square root of 21874685 is about 4677.0380584297. The cubic root of 21874685 is about 279.6708930872.

The spelling of 21874685 in words is "twenty-one million, eight hundred seventy-four thousand, six hundred eighty-five".