21798204 has 24 divisors (see below), whose sum is σ = 53074560. Its totient is φ = 6950064.

The previous prime is 21798197. The next prime is 21798221. The reversal of 21798204 is 40289712.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 39214 + ... + 39765.

It is an arithmetic number, because the mean of its divisors is an integer number (2211440).

Almost surely, 2^21798204 is an apocalyptic number.

It is an amenable number.

21798204 is an abundant number, since it is smaller than the sum of its proper divisors (31276356).

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

21798204 is a wasteful number, since it uses less digits than its factorization.

21798204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79009 (or 79007 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21798204 is about 4668.8546775414. The cubic root of 21798204 is about 279.3445724060.

The spelling of 21798204 in words is "twenty-one million, seven hundred ninety-eight thousand, two hundred four".