1222111212121 has 4 divisors (see below), whose sum is σ = 1233323241700. Its totient is φ = 1210899182544.

The previous prime is 1222111212103. The next prime is 1222111212131. The reversal of 1222111212121 is 1212121112221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1037262808521 + 184848403600 = 1018461^2 + 429940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222111212121 - 2⁵ = 1222111212089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222111212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5606014626 + ... + 5606014843.

It is an arithmetic number, because the mean of its divisors is an integer number (308330810425).

Almost surely, 2^{1222111212121} is an apocalyptic number.

It is an amenable number.

1222111212121 is a deficient number, since it is larger than the sum of its proper divisors (11212029579).

1222111212121 is a wasteful number, since it uses less digits than its factorization.

1222111212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11212029578.

The product of its digits is 64, while the sum is 19.

Adding to 1222111212121 its reverse (1212121112221), we get a palindrome (2434232324342).

The spelling of 1222111212121 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".