1221221211122 has 24 divisors (see below), whose sum is σ = 2019270571500. Its totient is φ = 553509966240.

The previous prime is 1221221211113. The next prime is 1221221211137. The reversal of 1221221211122 is 2211121221221.

It can be written as a sum of positive squares in 2 ways, for example, as 1143212162521 + 78009048601 = 1069211^2 + 279301^2 .

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 = 1221221211094 and 1221221211103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7145297 + ... + 7314212.

Almost surely, 2^{1221221211122} is an apocalyptic number.

1221221211122 is a deficient number, since it is larger than the sum of its proper divisors (798049360378).

1221221211122 is a wasteful number, since it uses less digits than its factorization.

1221221211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14459882 (or 14459871 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

Adding to 1221221211122 its reverse (2211121221221), we get a palindrome (3432342432343).

The spelling of 1221221211122 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-two".