1112122221121 has 2 divisors, whose sum is σ = 1112122221122. Its totient is φ = 1112122221120.

The previous prime is 1112122221109. The next prime is 1112122221131. The reversal of 1112122221121 is 1211222212111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765737004096 + 346385217025 = 875064^2 + 588545^2 .

It is an emirp because it is prime and its reverse (1211222212111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1112122221121 - 2³³ = 1103532286529 is a prime.

It is a super-2 number, since 2×1112122221121² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1112122221131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556061110560 + 556061110561.

It is an arithmetic number, because the mean of its divisors is an integer number (556061110561).

Almost surely, 2^{1112122221121} is an apocalyptic number.

It is an amenable number.

1112122221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112122221121 is an equidigital number, since it uses as much as digits as its factorization.

1112122221121 is an evil number, because the sum of its binary digits is even.

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

Adding to 1112122221121 its reverse (1211222212111), we get a palindrome (2323344433232).

The spelling of 1112122221121 in words is "one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".