21920300 has 72 divisors (see below), whose sum is σ = 51038400. Its totient is φ = 8147520.

The previous prime is 21920299. The next prime is 21920321. The reversal of 21920300 is 302912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157631 + ... + 157769.

Almost surely, 2^21920300 is an apocalyptic number.

21920300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21920300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25519200).

21920300 is an abundant number, since it is smaller than the sum of its proper divisors (29118100).

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

21920300 is a wasteful number, since it uses less digits than its factorization.

21920300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21920300 is about 4681.9120025904. The cubic root of 21920300 is about 279.8651561601.

The spelling of 21920300 in words is "twenty-one million, nine hundred twenty thousand, three hundred".