20212112221220 has 12 divisors (see below), whose sum is σ = 42445435664604. Its totient is φ = 8084844888480.

The previous prime is 20212112221187. The next prime is 20212112221363. The reversal of 20212112221220 is 2212221121202.

It can be written as a sum of positive squares in 2 ways, for example, as 2843155779556 + 17368956441664 = 1686166^2 + 4167608^2 .

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: 1010605611061 = 20212112221220 / (2 + 0 + 2 + 1 + 2 + 1 + 1 + 2 + 2 + 2 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 20212112221192 and 20212112221201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505302805511 + ... + 505302805550.

It is an arithmetic number, because the mean of its divisors is an integer number (3537119638717).

Almost surely, 2^{20212112221220} is an apocalyptic number.

20212112221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212112221220 is an abundant number, since it is smaller than the sum of its proper divisors (22233323443384).

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

20212112221220 is a wasteful number, since it uses less digits than its factorization.

20212112221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010605611070 (or 1010605611068 counting only the distinct ones).

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

Adding to 20212112221220 its reverse (2212221121202), we get a palindrome (22424333342422).

The spelling of 20212112221220 in words is "twenty trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty".