21801200 has 30 divisors (see below), whose sum is σ = 52378344. Its totient is φ = 8720320.

The previous prime is 21801187. The next prime is 21801211. The reversal of 21801200 is 210812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26852 + ... + 27651.

Almost surely, 2^21801200 is an apocalyptic number.

21801200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21801200 is an abundant number, since it is smaller than the sum of its proper divisors (30577144).

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

21801200 is a wasteful number, since it uses less digits than its factorization.

21801200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54521 (or 54510 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21801200 is about 4669.1755160842. The cubic root of 21801200 is about 279.3573697600.

The spelling of 21801200 in words is "twenty-one million, eight hundred one thousand, two hundred".