22121300 has 36 divisors (see below), whose sum is σ = 48343260. Its totient is φ = 8785920.

The previous prime is 22121293. The next prime is 22121303. The reversal of 22121300 is 312122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6739216 + 15382084 = 2596^2 + 3922^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14996 + ... + 16404.

Almost surely, 2^22121300 is an apocalyptic number.

22121300 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 22121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24171630).

22121300 is an abundant number, since it is smaller than the sum of its proper divisors (26221960).

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

22121300 is a wasteful number, since it uses less digits than its factorization.

22121300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 22121300 is about 4703.3286085495. The cubic root of 22121300 is about 280.7179703465.

Adding to 22121300 its reverse (312122), we get a palindrome (22433422).

The spelling of 22121300 in words is "twenty-two million, one hundred twenty-one thousand, three hundred".