21843804 has 48 divisors (see below), whose sum is σ = 52284960. Its totient is φ = 7096320.

The previous prime is 21843803. The next prime is 21843821. The reversal of 21843804 is 40834812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21843803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120594 + ... + 120774.

It is an arithmetic number, because the mean of its divisors is an integer number (1089270).

Almost surely, 2^21843804 is an apocalyptic number.

It is an amenable number.

21843804 is an abundant number, since it is smaller than the sum of its proper divisors (30441156).

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

21843804 is a wasteful number, since it uses less digits than its factorization.

21843804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 21843804 is about 4673.7355509271. The cubic root of 21843804 is about 279.5392251468.

The spelling of 21843804 in words is "twenty-one million, eight hundred forty-three thousand, eight hundred four".