222111212112 has 120 divisors (see below), whose sum is σ = 636359848488. Its totient is φ = 72299520000.

The previous prime is 222111212093. The next prime is 222111212159. The reversal of 222111212112 is 211212111222.

It can be written as a sum of positive squares in 4 ways, for example, as 73010201616 + 149101010496 = 270204^2 + 386136^2 .

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 23 ways as a sum of consecutive naturals, for example, 957112 + ... + 1166312.

Almost surely, 2^222111212112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222111212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318179924244).

222111212112 is an abundant number, since it is smaller than the sum of its proper divisors (414248636376).

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

222111212112 is a wasteful number, since it uses less digits than its factorization.

222111212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209389 (or 209380 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 222111212112 its reverse (211212111222), we get a palindrome (433323323334).

The spelling of 222111212112 in words is "two hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, one hundred twelve".