21898804 has 12 divisors (see below), whose sum is σ = 39138624. Its totient is φ = 10716344.

The previous prime is 21898801. The next prime is 21898837. The reversal of 21898804 is 40889812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58054 + ... + 58429.

It is an arithmetic number, because the mean of its divisors is an integer number (3261552).

Almost surely, 2^21898804 is an apocalyptic number.

It is an amenable number.

21898804 is a deficient number, since it is larger than the sum of its proper divisors (17239820).

21898804 is a wasteful number, since it uses less digits than its factorization.

21898804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116534 (or 116532 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 21898804 is about 4679.6157961952. The cubic root of 21898804 is about 279.7736435898.

The spelling of 21898804 in words is "twenty-one million, eight hundred ninety-eight thousand, eight hundred four".