21800364 has 24 divisors (see below), whose sum is σ = 51153648. Its totient is φ = 7225920.

The previous prime is 21800357. The next prime is 21800369. The reversal of 21800364 is 46300812.

It is a happy number.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21800369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2847 + ... + 7190.

It is an arithmetic number, because the mean of its divisors is an integer number (2131402).

Almost surely, 2^21800364 is an apocalyptic number.

It is an amenable number.

21800364 is an abundant number, since it is smaller than the sum of its proper divisors (29353284).

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

21800364 is a wasteful number, since it uses less digits than its factorization.

21800364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225 (or 10223 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21800364 is about 4669.0859919260. The cubic root of 21800364 is about 279.3537989206.

The spelling of 21800364 in words is "twenty-one million, eight hundred thousand, three hundred sixty-four".