22121100220 has 12 divisors (see below), whose sum is σ = 46454310504. Its totient is φ = 8848440080.

The previous prime is 22121100217. The next prime is 22121100223. The reversal of 22121100220 is 2200112122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22121100217) and next prime (22121100223).

It is a self number, because there is not a number n which added to its sum of digits gives 22121100220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121100223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553027486 + ... + 553027525.

It is an arithmetic number, because the mean of its divisors is an integer number (3871192542).

Almost surely, 2^22121100220 is an apocalyptic number.

22121100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121100220 is an abundant number, since it is smaller than the sum of its proper divisors (24333210284).

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

22121100220 is a wasteful number, since it uses less digits than its factorization.

22121100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106055020 (or 1106055018 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22121100220 its reverse (2200112122), we get a palindrome (24321212342).

The spelling of 22121100220 in words is "twenty-two billion, one hundred twenty-one million, one hundred thousand, two hundred twenty".