21625204 has 12 divisors (see below), whose sum is σ = 38767428. Its totient is φ = 10548800.

The previous prime is 21625199. The next prime is 21625229. The reversal of 21625204 is 40252612.

It can be written as a sum of positive squares in 2 ways, for example, as 940900 + 20684304 = 970^2 + 4548^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65767 + ... + 66094.

It is an arithmetic number, because the mean of its divisors is an integer number (3230619).

Almost surely, 2^21625204 is an apocalyptic number.

It is an amenable number.

21625204 is a deficient number, since it is larger than the sum of its proper divisors (17142224).

21625204 is a wasteful number, since it uses less digits than its factorization.

21625204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131906 (or 131904 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21625204 is about 4650.2907435987. The cubic root of 21625204 is about 278.6036088431.

Adding to 21625204 its reverse (40252612), we get a palindrome (61877816).

The spelling of 21625204 in words is "twenty-one million, six hundred twenty-five thousand, two hundred four".