1221022222 has 16 divisors (see below), whose sum is σ = 2096760960. Its totient is φ = 522400248.

The previous prime is 1221022193. The next prime is 1221022223. The reversal of 1221022222 is 2222201221.

1221022222 is a modest number, since divided by 22222 gives 12210 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1221022196 and 1221022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221022223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66072 + ... + 82507.

It is an arithmetic number, because the mean of its divisors is an integer number (131047560).

Almost surely, 2^1221022222 is an apocalyptic number.

1221022222 is a deficient number, since it is larger than the sum of its proper divisors (875738738).

1221022222 is a wasteful number, since it uses less digits than its factorization.

1221022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149175.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1221022222 is about 34943.1283945785. The cubic root of 1221022222 is about 1068.8280825183.

Adding to 1221022222 its reverse (2222201221), we get a palindrome (3443223443).

The spelling of 1221022222 in words is "one billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-two".