1221123122 has 16 divisors (see below), whose sum is σ = 1954505760. Its totient is φ = 570501792.

The previous prime is 1221123109. The next prime is 1221123149. The reversal of 1221123122 is 2213211221.

It is a super-2 number, since 2×1221123122² = 2982283358166053768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221123122.

It is an unprimeable number.

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, 217328 + ... + 222875.

It is an arithmetic number, because the mean of its divisors is an integer number (122156610).

Almost surely, 2^1221123122 is an apocalyptic number.

1221123122 is a deficient number, since it is larger than the sum of its proper divisors (733382638).

1221123122 is a wasteful number, since it uses less digits than its factorization.

1221123122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440297.

The product of its digits is 96, while the sum is 17.

The square root of 1221123122 is about 34944.5721393180. The cubic root of 1221123122 is about 1068.8575228187.

Adding to 1221123122 its reverse (2213211221), we get a palindrome (3434334343).

The spelling of 1221123122 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-two".