1121521221361 has 2 divisors, whose sum is σ = 1121521221362. Its totient is φ = 1121521221360.

The previous prime is 1121521221343. The next prime is 1121521221449. The reversal of 1121521221361 is 1631221251211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977448595600 + 144072625761 = 988660^2 + 379569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121521221361 - 2¹⁷ = 1121521090289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121521261361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560760610680 + 560760610681.

It is an arithmetic number, because the mean of its divisors is an integer number (560760610681).

Almost surely, 2^{1121521221361} is an apocalyptic number.

It is an amenable number.

1121521221361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121521221361 is an equidigital number, since it uses as much as digits as its factorization.

1121521221361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

Adding to 1121521221361 its reverse (1631221251211), we get a palindrome (2752742472572).

The spelling of 1121521221361 in words is "one trillion, one hundred twenty-one billion, five hundred twenty-one million, two hundred twenty-one thousand, three hundred sixty-one".