1121200121161 has 2 divisors, whose sum is σ = 1121200121162. Its totient is φ = 1121200121160.

The previous prime is 1121200121143. The next prime is 1121200121207. The reversal of 1121200121161 is 1611210021211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1100256242761 + 20943878400 = 1048931^2 + 144720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121200121161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121200121101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560600060580 + 560600060581.

It is an arithmetic number, because the mean of its divisors is an integer number (560600060581).

Almost surely, 2^{1121200121161} is an apocalyptic number.

It is an amenable number.

1121200121161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121200121161 is an equidigital number, since it uses as much as digits as its factorization.

1121200121161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 1121200121161 its reverse (1611210021211), we get a palindrome (2732410142372).

The spelling of 1121200121161 in words is "one trillion, one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, one hundred sixty-one".