22721900 has 18 divisors (see below), whose sum is σ = 49306740. Its totient is φ = 9088720.

The previous prime is 22721899. The next prime is 22721921. The reversal of 22721900 is 912722.

It is a super-3 number, since 3×22721900³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 113510 + ... + 113709.

Almost surely, 2^22721900 is an apocalyptic number.

22721900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22721900 is an abundant number, since it is smaller than the sum of its proper divisors (26584840).

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

22721900 is a wasteful number, since it uses less digits than its factorization.

22721900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227233 (or 227226 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22721900 is about 4766.7494165311. The cubic root of 22721900 is about 283.2358449686.

The spelling of 22721900 in words is "twenty-two million, seven hundred twenty-one thousand, nine hundred".