21863804 has 12 divisors (see below), whose sum is σ = 39496128. Its totient is φ = 10579200.

The previous prime is 21863801. The next prime is 21863827. The reversal of 21863804 is 40836812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21863801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88037 + ... + 88284.

It is an arithmetic number, because the mean of its divisors is an integer number (3291344).

Almost surely, 2^21863804 is an apocalyptic number.

It is an amenable number.

21863804 is a deficient number, since it is larger than the sum of its proper divisors (17632324).

21863804 is a wasteful number, since it uses less digits than its factorization.

21863804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176356 (or 176354 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21863804 is about 4675.8746775336. The cubic root of 21863804 is about 279.6245136963.

The spelling of 21863804 in words is "twenty-one million, eight hundred sixty-three thousand, eight hundred four".