22212121001220 has 72 divisors (see below), whose sum is σ = 67430283822720. Its totient is φ = 5918527494720.

The previous prime is 22212121001209. The next prime is 22212121001227. The reversal of 22212121001220 is 2210012121222.

It is a happy number.

22212121001220 is a `hidden beast` number, since 2 + 221 + 212 + 10 + 0 + 1 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22212121001193 and 22212121001202.

It is not an unprimeable number, because it can be changed into a prime (22212121001227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48780796 + ... + 49234035.

It is an arithmetic number, because the mean of its divisors is an integer number (936531719760).

Almost surely, 2^{22212121001220} is an apocalyptic number.

22212121001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212121001220 is an abundant number, since it is smaller than the sum of its proper divisors (45218162821500).

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

22212121001220 is a wasteful number, since it uses less digits than its factorization.

22212121001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98016105 (or 98016100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22212121001220 its reverse (2210012121222), we get a palindrome (24422133122442).

The spelling of 22212121001220 in words is "twenty-two trillion, two hundred twelve billion, one hundred twenty-one million, one thousand, two hundred twenty".