22121131220 has 12 divisors (see below), whose sum is σ = 46454375604. Its totient is φ = 8848452480.

The previous prime is 22121131213. The next prime is 22121131223. The reversal of 22121131220 is 2213112122.

It can be written as a sum of positive squares in 2 ways, for example, as 17183539396 + 4937591824 = 131086^2 + 70268^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121131223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553028261 + ... + 553028300.

It is an arithmetic number, because the mean of its divisors is an integer number (3871197967).

Almost surely, 2^22121131220 is an apocalyptic number.

22121131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121131220 is an abundant number, since it is smaller than the sum of its proper divisors (24333244384).

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

22121131220 is a wasteful number, since it uses less digits than its factorization.

22121131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106056570 (or 1106056568 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 22121131220 its reverse (2213112122), we get a palindrome (24334243342).

The spelling of 22121131220 in words is "twenty-two billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".