21885974 has 8 divisors (see below), whose sum is σ = 35813448. Its totient is φ = 9948160.

The previous prime is 21885961. The next prime is 21886027. The reversal of 21885974 is 47958812.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497387 + ... + 497430.

It is an arithmetic number, because the mean of its divisors is an integer number (4476681).

Almost surely, 2^21885974 is an apocalyptic number.

21885974 is a deficient number, since it is larger than the sum of its proper divisors (13927474).

21885974 is a wasteful number, since it uses less digits than its factorization.

21885974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994830.

The product of its digits is 161280, while the sum is 44.

The square root of 21885974 is about 4678.2447563162. The cubic root of 21885974 is about 279.7189952922.

The spelling of 21885974 in words is "twenty-one million, eight hundred eighty-five thousand, nine hundred seventy-four".