2222121312 has 36 divisors (see below), whose sum is σ = 6319158300. Its totient is φ = 740707008.

The previous prime is 2222121283. The next prime is 2222121331. The reversal of 2222121312 is 2131212222.

It is a tau number, because it is divible by the number of its divisors (36).

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3857562 + ... + 3858137.

It is an arithmetic number, because the mean of its divisors is an integer number (175532175).

Almost surely, 2^2222121312 is an apocalyptic number.

It is an amenable number.

2222121312 is an abundant number, since it is smaller than the sum of its proper divisors (4097036988).

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

2222121312 is a wasteful number, since it uses less digits than its factorization.

2222121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715715 (or 7715704 counting only the distinct ones).

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

The square root of 2222121312 is about 47139.3817524159. The cubic root of 2222121312 is about 1304.9361275824.

Adding to 2222121312 its reverse (2131212222), we get a palindrome (4353333534).

The spelling of 2222121312 in words is "two billion, two hundred twenty-two million, one hundred twenty-one thousand, three hundred twelve".