1121220121121 has 4 divisors (see below), whose sum is σ = 1133818100100. Its totient is φ = 1108622142144.

The previous prime is 1121220121117. The next prime is 1121220121159. The reversal of 1121220121121 is 1211210221211.

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 89319690496 + 1031900430625 = 298864^2 + 1015825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121220121121 - 2² = 1121220121117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121220121121.

It is not an unprimeable number, because it can be changed into a prime (1121220141121) 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, 6298989356 + ... + 6298989533.

It is an arithmetic number, because the mean of its divisors is an integer number (283454525025).

Almost surely, 2^{1121220121121} is an apocalyptic number.

It is an amenable number.

1121220121121 is a deficient number, since it is larger than the sum of its proper divisors (12597978979).

1121220121121 is an equidigital number, since it uses as much as digits as its factorization.

1121220121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12597978978.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1121220121121 its reverse (1211210221211), we get a palindrome (2332430342332).

The spelling of 1121220121121 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".