21088204 has 6 divisors (see below), whose sum is σ = 36904364. Its totient is φ = 10544100.

The previous prime is 21088201. The next prime is 21088219. The reversal of 21088204 is 40288012.

It is not an unprimeable number, because it can be changed into a prime (21088201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2636022 + ... + 2636029.

Almost surely, 2^21088204 is an apocalyptic number.

It is an amenable number.

21088204 is a deficient number, since it is larger than the sum of its proper divisors (15816160).

21088204 is a wasteful number, since it uses less digits than its factorization.

21088204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272055 (or 5272053 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 21088204 is about 4592.1894560220. The cubic root of 21088204 is about 276.2781450000.

The spelling of 21088204 in words is "twenty-one million, eighty-eight thousand, two hundred four".