22221900 has 54 divisors (see below), whose sum is σ = 69656132. Its totient is φ = 5925600.

The previous prime is 22221889. The next prime is 22221911. The reversal of 22221900 is 912222.

It is an interprime number because it is at equal distance from previous prime (22221889) and next prime (22221911).

It is a super-2 number, since 2×22221900² = 987625679220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11446 + ... + 13245.

Almost surely, 2^22221900 is an apocalyptic number.

22221900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221900 is an abundant number, since it is smaller than the sum of its proper divisors (47434232).

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

22221900 is a wasteful number, since it uses less digits than its factorization.

22221900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24711 (or 24701 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 22221900 is about 4714.0110309587. The cubic root of 22221900 is about 281.1428628969.

It can be divided in two parts, 222 and 21900, that added together give a palindrome (22122).

The spelling of 22221900 in words is "twenty-two million, two hundred twenty-one thousand, nine hundred".