21895804 has 24 divisors (see below), whose sum is σ = 44862048. Its totient is φ = 9154560.

The previous prime is 21895799. The next prime is 21895807. The reversal of 21895804 is 40859812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21895807) by changing a digit.

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, 8389 + ... + 10684.

It is an arithmetic number, because the mean of its divisors is an integer number (1869252).

Almost surely, 2^21895804 is an apocalyptic number.

It is an amenable number.

21895804 is an abundant number, since it is smaller than the sum of its proper divisors (22966244).

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

21895804 is a wasteful number, since it uses less digits than its factorization.

21895804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19125 (or 19123 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 21895804 is about 4679.2952460814. The cubic root of 21895804 is about 279.7608672565.

The spelling of 21895804 in words is "twenty-one million, eight hundred ninety-five thousand, eight hundred four".