1222001122156 has 12 divisors (see below), whose sum is σ = 2231480310192. Its totient is φ = 584435319248.

The previous prime is 1222001122109. The next prime is 1222001122157. The reversal of 1222001122156 is 6512211002221.

It is a self number, because there is not a number n which added to its sum of digits gives 1222001122156.

It is not an unprimeable number, because it can be changed into a prime (1222001122157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641310355 + ... + 6641310538.

It is an arithmetic number, because the mean of its divisors is an integer number (185956692516).

Almost surely, 2^{1222001122156} is an apocalyptic number.

It is an amenable number.

1222001122156 is a deficient number, since it is larger than the sum of its proper divisors (1009479188036).

1222001122156 is a wasteful number, since it uses less digits than its factorization.

1222001122156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13282620920 (or 13282620918 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 1222001122156 its reverse (6512211002221), we get a palindrome (7734212124377).

The spelling of 1222001122156 in words is "one trillion, two hundred twenty-two billion, one million, one hundred twenty-two thousand, one hundred fifty-six".