1222211122121 has 16 divisors (see below), whose sum is σ = 1345336197120. Its totient is φ = 1101108289680.

The previous prime is 1222211122091. The next prime is 1222211122159. The reversal of 1222211122121 is 1212211122221.

It is a cyclic number.

It is not a de Polignac number, because 1222211122121 - 2¹⁴ = 1222211105737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222211122093 and 1222211122102.

It is not an unprimeable number, because it can be changed into a prime (1222211122421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745970 + ... + 1732308.

It is an arithmetic number, because the mean of its divisors is an integer number (84083512320).

Almost surely, 2^{1222211122121} is an apocalyptic number.

1222211122121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222211122121 is a deficient number, since it is larger than the sum of its proper divisors (123125074999).

1222211122121 is a wasteful number, since it uses less digits than its factorization.

1222211122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987364.

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

Adding to 1222211122121 its reverse (1212211122221), we get a palindrome (2434422244342).

The spelling of 1222211122121 in words is "one trillion, two hundred twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".