21982200 has 48 divisors (see below), whose sum is σ = 68146680. Its totient is φ = 5861760.

The previous prime is 21982171. The next prime is 21982201. The reversal of 21982200 is 228912.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17719 + ... + 18918.

Almost surely, 2^21982200 is an apocalyptic number.

21982200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21982200 is an abundant number, since it is smaller than the sum of its proper divisors (46164480).

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

21982200 is a wasteful number, since it uses less digits than its factorization.

21982200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36656 (or 36647 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21982200 is about 4688.5178894828. The cubic root of 21982200 is about 280.1283425237.

The spelling of 21982200 in words is "twenty-one million, nine hundred eighty-two thousand, two hundred".