22121321232800 has 72 divisors (see below), whose sum is σ = 54154104228000. Its totient is φ = 8823880666880.

The previous prime is 22121321232799. The next prime is 22121321232809. The reversal of 22121321232800 is 823212312122.

It is a happy number.

It is a super-2 number, since 2×22121321232800² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22121321232809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38224850 + ... + 38799249.

It is an arithmetic number, because the mean of its divisors is an integer number (752140336500).

Almost surely, 2^{22121321232800} is an apocalyptic number.

22121321232800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121321232800 is an abundant number, since it is smaller than the sum of its proper divisors (32032782995200).

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

22121321232800 is a wasteful number, since it uses less digits than its factorization.

22121321232800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77024478 (or 77024465 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 22121321232800 its reverse (823212312122), we get a palindrome (22944533544922).

The spelling of 22121321232800 in words is "twenty-two trillion, one hundred twenty-one billion, three hundred twenty-one million, two hundred thirty-two thousand, eight hundred".