22012900 has 144 divisors (see below), whose sum is σ = 61246080. Its totient is φ = 6681600.

The previous prime is 22012897. The next prime is 22012901. The reversal of 22012900 is 921022.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22012901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373071 + ... + 373129.

It is an arithmetic number, because the mean of its divisors is an integer number (425320).

Almost surely, 2^22012900 is an apocalyptic number.

22012900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22012900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30623040).

22012900 is an abundant number, since it is smaller than the sum of its proper divisors (39233180).

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

22012900 is a wasteful number, since it uses less digits than its factorization.

22012900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 22012900 is about 4691.7907029193. The cubic root of 22012900 is about 280.2586894969.

Adding to 22012900 its reverse (921022), we get a palindrome (22933922).

The spelling of 22012900 in words is "twenty-two million, twelve thousand, nine hundred".