21904274 has 24 divisors (see below), whose sum is σ = 38616588. Its totient is φ = 9290400.

The previous prime is 21904273. The next prime is 21904277. The reversal of 21904274 is 47240912.

It can be written as a sum of positive squares in 2 ways, for example, as 14025025 + 7879249 = 3745^2 + 2807^2 .

It is not an unprimeable number, because it can be changed into a prime (21904271) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8792 + ... + 11004.

Almost surely, 2^21904274 is an apocalyptic number.

21904274 is a deficient number, since it is larger than the sum of its proper divisors (16712314).

21904274 is a wasteful number, since it uses less digits than its factorization.

21904274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21904274 is about 4680.2002093928. The cubic root of 21904274 is about 279.7969361013.

The spelling of 21904274 in words is "twenty-one million, nine hundred four thousand, two hundred seventy-four".