222120222012 has 144 divisors (see below), whose sum is σ = 630604479232. Its totient is φ = 65457745920.

The previous prime is 222120221977. The next prime is 222120222013. The reversal of 222120222012 is 210222021222.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120222013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1328358 + ... + 1486194.

Almost surely, 2^222120222012 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 222120222012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315302239616).

222120222012 is an abundant number, since it is smaller than the sum of its proper divisors (408484257220).

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

222120222012 is a wasteful number, since it uses less digits than its factorization.

222120222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157988 (or 157983 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 222120222012 its reverse (210222021222), we get a palindrome (432342243234).

The spelling of 222120222012 in words is "two hundred twenty-two billion, one hundred twenty million, two hundred twenty-two thousand, twelve".