21764300 has 18 divisors (see below), whose sum is σ = 47228748. Its totient is φ = 8705680.

The previous prime is 21764299. The next prime is 21764341. The reversal of 21764300 is 346712.

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, 108722 + ... + 108921.

Almost surely, 2^21764300 is an apocalyptic number.

21764300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21764300 is an abundant number, since it is smaller than the sum of its proper divisors (25464448).

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

21764300 is a wasteful number, since it uses less digits than its factorization.

21764300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217657 (or 217650 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21764300 is about 4665.2223955563. Note that the first 3 decimals coincide. The cubic root of 21764300 is about 279.1996703636.

The spelling of 21764300 in words is "twenty-one million, seven hundred sixty-four thousand, three hundred".