21025204 has 12 divisors (see below), whose sum is σ = 36836800. Its totient is φ = 10500408.

The previous prime is 21025201. The next prime is 21025211. The reversal of 21025204 is 40252012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627 + ... + 6685.

Almost surely, 2^21025204 is an apocalyptic number.

It is an amenable number.

21025204 is a deficient number, since it is larger than the sum of its proper divisors (15811596).

21025204 is a wasteful number, since it uses less digits than its factorization.

21025204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102 (or 6100 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21025204 is about 4585.3248521779. The cubic root of 21025204 is about 276.0027479948.

Adding to 21025204 its reverse (40252012), we get a palindrome (61277216).

The spelling of 21025204 in words is "twenty-one million, twenty-five thousand, two hundred four".