22212221101220 has 12 divisors (see below), whose sum is σ = 46645664312604. Its totient is φ = 8884888440480.

The previous prime is 22212221101129. The next prime is 22212221101223. The reversal of 22212221101220 is 2210112221222.

It can be written as a sum of positive squares in 2 ways, for example, as 5621328032356 + 16590893068864 = 2370934^2 + 4073192^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1110611055061 = 22212221101220 / (2 + 2 + 2 + 1 + 2 + 2 + 2 + 1 + 1 + 0 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 22212221101192 and 22212221101201.

It is not an unprimeable number, because it can be changed into a prime (22212221101223) 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, 555305527511 + ... + 555305527550.

It is an arithmetic number, because the mean of its divisors is an integer number (3887138692717).

Almost surely, 2^{22212221101220} is an apocalyptic number.

22212221101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212221101220 is an abundant number, since it is smaller than the sum of its proper divisors (24433443211384).

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

22212221101220 is a wasteful number, since it uses less digits than its factorization.

22212221101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110611055070 (or 1110611055068 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22212221101220 its reverse (2210112221222), we get a palindrome (24422333322442).

The spelling of 22212221101220 in words is "twenty-two trillion, two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty".