21693204 has 48 divisors (see below), whose sum is σ = 60571840. Its totient is φ = 6674400.

The previous prime is 21693197. The next prime is 21693227. The reversal of 21693204 is 40239612.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6322 + ... + 9129.

Almost surely, 2^21693204 is an apocalyptic number.

It is an amenable number.

21693204 is an abundant number, since it is smaller than the sum of its proper divisors (38878636).

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

21693204 is a wasteful number, since it uses less digits than its factorization.

21693204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15477 (or 15469 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21693204 is about 4657.5963758145. The cubic root of 21693204 is about 278.8953243584.

The spelling of 21693204 in words is "twenty-one million, six hundred ninety-three thousand, two hundred four".