2112111220 has 24 divisors (see below), whose sum is σ = 4578513408. Its totient is φ = 817591200.

The previous prime is 2112111217. The next prime is 2112111241. The reversal of 2112111220 is 221112112.

It is a super-2 number, since 2×2112111220² = 8922027611299776800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2112111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1702696 + ... + 1703935.

It is an arithmetic number, because the mean of its divisors is an integer number (190771392).

Almost surely, 2^2112111220 is an apocalyptic number.

2112111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2112111220 is an abundant number, since it is smaller than the sum of its proper divisors (2466402188).

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

2112111220 is a wasteful number, since it uses less digits than its factorization.

2112111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406671 (or 3406669 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2112111220 is about 45957.7112136799. The cubic root of 2112111220 is about 1283.0362531919.

Adding to 2112111220 its reverse (221112112), we get a palindrome (2333223332).

The spelling of 2112111220 in words is "two billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty".