21475204 has 12 divisors (see below), whose sum is σ = 37621584. Its totient is φ = 10726184.

The previous prime is 21475183. The next prime is 21475217. The reversal of 21475204 is 40257412.

It is a super-2 number, since 2×21475204² = 922368773683232, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2487 + ... + 7009.

It is an arithmetic number, because the mean of its divisors is an integer number (3135132).

Almost surely, 2^21475204 is an apocalyptic number.

It is an amenable number.

21475204 is a deficient number, since it is larger than the sum of its proper divisors (16146380).

21475204 is a wasteful number, since it uses less digits than its factorization.

21475204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5714 (or 5712 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21475204 is about 4634.1346549275. The cubic root of 21475204 is about 277.9579495772.

The spelling of 21475204 in words is "twenty-one million, four hundred seventy-five thousand, two hundred four".