21904498 has 16 divisors (see below), whose sum is σ = 40964544. Its totient is φ = 8534160.

The previous prime is 21904489. The next prime is 21904523. The reversal of 21904498 is 89440912.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 70965 + ... + 71272.

It is an arithmetic number, because the mean of its divisors is an integer number (2560284).

Almost surely, 2^21904498 is an apocalyptic number.

21904498 is a deficient number, since it is larger than the sum of its proper divisors (19060046).

21904498 is a wasteful number, since it uses less digits than its factorization.

21904498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142257.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21904498 is about 4680.2241399318. The cubic root of 21904498 is about 279.7978898619.

The spelling of 21904498 in words is "twenty-one million, nine hundred four thousand, four hundred ninety-eight".