22121233220 has 48 divisors (see below), whose sum is σ = 47254233600. Its totient is φ = 8696776704.

The previous prime is 22121233217. The next prime is 22121233229. The reversal of 22121233220 is 2233212122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22121233192 and 22121233201.

It is not an unprimeable number, because it can be changed into a prime (22121233229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583277 + ... + 620043.

It is an arithmetic number, because the mean of its divisors is an integer number (984463200).

Almost surely, 2^22121233220 is an apocalyptic number.

22121233220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121233220 is an abundant number, since it is smaller than the sum of its proper divisors (25133000380).

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

22121233220 is a wasteful number, since it uses less digits than its factorization.

22121233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37292 (or 37290 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 22121233220 its reverse (2233212122), we get a palindrome (24354445342).

The spelling of 22121233220 in words is "twenty-two billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty".