21764200 has 24 divisors (see below), whose sum is σ = 50602230. Its totient is φ = 8705600.

The previous prime is 21764191. The next prime is 21764219. The reversal of 21764200 is 246712.

It can be written as a sum of positive squares in 3 ways, for example, as 17089956 + 4674244 = 4134^2 + 2162^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54211 + ... + 54610.

Almost surely, 2^21764200 is an apocalyptic number.

21764200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21764200 is an abundant number, since it is smaller than the sum of its proper divisors (28838030).

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

21764200 is a wasteful number, since it uses less digits than its factorization.

21764200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108837 (or 108828 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21764200 is about 4665.2116779413. The cubic root of 21764200 is about 279.1992427518.

The spelling of 21764200 in words is "twenty-one million, seven hundred sixty-four thousand, two hundred".