21904850 has 24 divisors (see below), whose sum is σ = 44448048. Its totient is φ = 7965200.

The previous prime is 21904843. The next prime is 21904859. The reversal of 21904850 is 5840912.

It is not an unprimeable number, because it can be changed into a prime (21904859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19364 + ... + 20463.

It is an arithmetic number, because the mean of its divisors is an integer number (1852002).

Almost surely, 2^21904850 is an apocalyptic number.

21904850 is an abundant number, since it is smaller than the sum of its proper divisors (22543198).

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

21904850 is a wasteful number, since it uses less digits than its factorization.

21904850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39850 (or 39845 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21904850 is about 4680.2617448173. The cubic root of 21904850 is about 279.7993886154.

The spelling of 21904850 in words is "twenty-one million, nine hundred four thousand, eight hundred fifty".