21001204 has 24 divisors (see below), whose sum is σ = 42862400. Its totient is φ = 8999928.

The previous prime is 21001187. The next prime is 21001247. The reversal of 21001204 is 40210012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6282 + ... + 9025.

Almost surely, 2^21001204 is an apocalyptic number.

It is an amenable number.

21001204 is an abundant number, since it is smaller than the sum of its proper divisors (21861196).

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

21001204 is a wasteful number, since it uses less digits than its factorization.

21001204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15332 (or 15316 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21001204 is about 4582.7070602429. The cubic root of 21001204 is about 275.8976901480.

Adding to 21001204 its reverse (40210012), we get a palindrome (61211216).

The spelling of 21001204 in words is "twenty-one million, one thousand, two hundred four".