21354804 has 36 divisors (see below), whose sum is σ = 54146820. Its totient is φ = 7096320.

The previous prime is 21354799. The next prime is 21354847. The reversal of 21354804 is 40845312.

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 21178404 = 420^2 + 4602^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14452 + ... + 15860.

Almost surely, 2^21354804 is an apocalyptic number.

It is an amenable number.

21354804 is an abundant number, since it is smaller than the sum of its proper divisors (32792016).

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

21354804 is a wasteful number, since it uses less digits than its factorization.

21354804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21354804 is about 4621.1258368497. The cubic root of 21354804 is about 277.4375218486.

The spelling of 21354804 in words is "twenty-one million, three hundred fifty-four thousand, eight hundred four".