222121211112 has 96 divisors (see below), whose sum is σ = 623955107880. Its totient is φ = 71325964800.

The previous prime is 222121211107. The next prime is 222121211113. The reversal of 222121211112 is 211112121222.

222121211112 is a `hidden beast` number, since 222 + 121 + 211 + 112 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 221903176356 + 218034756 = 471066^2 + 14766^2 .

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 not an unprimeable number, because it can be changed into a prime (222121211113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143703 + ... + 681830.

Almost surely, 2^222121211112 is an apocalyptic number.

It is an amenable number.

222121211112 is an abundant number, since it is smaller than the sum of its proper divisors (401833896768).

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

222121211112 is a wasteful number, since it uses less digits than its factorization.

222121211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825683 (or 825676 counting only the distinct ones).

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

Adding to 222121211112 its reverse (211112121222), we get a palindrome (433233332334).

The spelling of 222121211112 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twelve".