1221112222 has 16 divisors (see below), whose sum is σ = 2067087600. Its totient is φ = 535911040.

The previous prime is 1221112201. The next prime is 1221112241. The reversal of 1221112222 is 2222111221.

It is a happy number.

It is a super-2 number, since 2×1221112222² = 2982230117435554568, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221112196 and 1221112205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956347 + ... + 957622.

It is an arithmetic number, because the mean of its divisors is an integer number (129192975).

Almost surely, 2^1221112222 is an apocalyptic number.

1221112222 is a deficient number, since it is larger than the sum of its proper divisors (845975378).

1221112222 is a wasteful number, since it uses less digits than its factorization.

1221112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914011.

The product of its digits is 64, while the sum is 16.

The square root of 1221112222 is about 34944.4161776957. The cubic root of 1221112222 is about 1068.8543425275.

Adding to 1221112222 its reverse (2222111221), we get a palindrome (3443223443).

The spelling of 1221112222 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-two".