22121121220 has 48 divisors (see below), whose sum is σ = 50688344448. Its totient is φ = 8042319360.

The previous prime is 22121121173. The next prime is 22121121233. The reversal of 22121121220 is 2212112122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22121121194 and 22121121203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1493692 + ... + 1508428.

It is an arithmetic number, because the mean of its divisors is an integer number (1056007176).

Almost surely, 2^22121121220 is an apocalyptic number.

22121121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121121220 is an abundant number, since it is smaller than the sum of its proper divisors (28567223228).

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

22121121220 is a wasteful number, since it uses less digits than its factorization.

22121121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21580 (or 21578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121121220 its reverse (2212112122), we get a palindrome (24333233342).

It can be divided in two parts, 22121 and 121220, that added together give a palindrome (143341).

The spelling of 22121121220 in words is "twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".