2111212221220 has 12 divisors (see below), whose sum is σ = 4433545664604. Its totient is φ = 844484888480.

The previous prime is 2111212221203. The next prime is 2111212221241. The reversal of 2111212221220 is 221222121112.

It can be written as a sum of positive squares in 2 ways, for example, as 776739043584 + 1334473177636 = 881328^2 + 1155194^2 .

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, 52780305511 + ... + 52780305550.

It is an arithmetic number, because the mean of its divisors is an integer number (369462138717).

Almost surely, 2^{2111212221220} is an apocalyptic number.

2111212221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111212221220 is an abundant number, since it is smaller than the sum of its proper divisors (2322333443384).

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

2111212221220 is a wasteful number, since it uses less digits than its factorization.

2111212221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105560611070 (or 105560611068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2111212221220 its reverse (221222121112), we get a palindrome (2332434342332).

The spelling of 2111212221220 in words is "two trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty".