21841804 has 12 divisors (see below), whose sum is σ = 40471704. Its totient is φ = 10278464.

The previous prime is 21841751. The next prime is 21841817. The reversal of 21841804 is 40814812.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160534 + ... + 160669.

It is an arithmetic number, because the mean of its divisors is an integer number (3372642).

Almost surely, 2^21841804 is an apocalyptic number.

It is an amenable number.

21841804 is a deficient number, since it is larger than the sum of its proper divisors (18629900).

21841804 is a wasteful number, since it uses less digits than its factorization.

21841804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321224 (or 321222 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21841804 is about 4673.5215844158. The cubic root of 21841804 is about 279.5306934290.

The spelling of 21841804 in words is "twenty-one million, eight hundred forty-one thousand, eight hundred four".