21841204 has 24 divisors (see below), whose sum is σ = 47654208. Its totient is φ = 8509440.

The previous prime is 21841177. The next prime is 21841207. The reversal of 21841204 is 40214812.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841207) 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 7 ways as a sum of consecutive naturals, for example, 35149 + ... + 35764.

It is an arithmetic number, because the mean of its divisors is an integer number (1985592).

Almost surely, 2^21841204 is an apocalyptic number.

It is an amenable number.

21841204 is an abundant number, since it is smaller than the sum of its proper divisors (25813004).

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

21841204 is a wasteful number, since it uses less digits than its factorization.

21841204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70935 (or 70933 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21841204 is about 4673.4573925521. The cubic root of 21841204 is about 279.5281338121.

The spelling of 21841204 in words is "twenty-one million, eight hundred forty-one thousand, two hundred four".