12221900 has 18 divisors (see below), whose sum is σ = 26521740. Its totient is φ = 4888720.

The previous prime is 12221893. The next prime is 12221917. The reversal of 12221900 is 912221.

It is a super-2 number, since 2×12221900² = 298749679220000, which contains 22 as substring.

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, 61010 + ... + 61209.

It is an arithmetic number, because the mean of its divisors is an integer number (1473430).

Almost surely, 2^12221900 is an apocalyptic number.

12221900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221900 is an abundant number, since it is smaller than the sum of its proper divisors (14299840).

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

12221900 is a wasteful number, since it uses less digits than its factorization.

12221900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122233 (or 122226 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12221900 is about 3495.9834095716. The cubic root of 12221900 is about 230.3454167172.

It can be divided in two parts, 122 and 21900, that added together give a palindrome (22022).

The spelling of 12221900 in words is "twelve million, two hundred twenty-one thousand, nine hundred".