2123112222 has 120 divisors (see below), whose sum is σ = 5976553968. Its totient is φ = 551422080.

The previous prime is 2123112203. The next prime is 2123112239. The reversal of 2123112222 is 2222113212.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 2123112195 and 2123112204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 129478 + ... + 144950.

Almost surely, 2^2123112222 is an apocalyptic number.

2123112222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123112222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2988276984).

2123112222 is an abundant number, since it is smaller than the sum of its proper divisors (3853441746).

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

2123112222 is a wasteful number, since it uses less digits than its factorization.

2123112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15516 (or 15496 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2123112222 is about 46077.2419096456. The cubic root of 2123112222 is about 1285.2599759638.

Adding to 2123112222 its reverse (2222113212), we get a palindrome (4345225434).

The spelling of 2123112222 in words is "two billion, one hundred twenty-three million, one hundred twelve thousand, two hundred twenty-two".