222142212 has 72 divisors (see below), whose sum is σ = 574302456. Its totient is φ = 72382464.

The previous prime is 222142189. The next prime is 222142229. The reversal of 222142212 is 212241222.

It can be written as a sum of positive squares in 4 ways, for example, as 5875776 + 216266436 = 2424^2 + 14706^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 359728 + ... + 360344.

It is an arithmetic number, because the mean of its divisors is an integer number (7976423).

Almost surely, 2^222142212 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 222142212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287151228).

222142212 is an abundant number, since it is smaller than the sum of its proper divisors (352160244).

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

222142212 is a wasteful number, since it uses less digits than its factorization.

222142212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 832 counting only the distinct ones).

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

The square root of 222142212 is about 14904.4359839613. The cubic root of 222142212 is about 605.6341614400.

Adding to 222142212 its reverse (212241222), we get a palindrome (434383434).

The spelling of 222142212 in words is "two hundred twenty-two million, one hundred forty-two thousand, two hundred twelve".