1121521221449 has 2 divisors, whose sum is σ = 1121521221450. Its totient is φ = 1121521221448.

The previous prime is 1121521221361. The next prime is 1121521221473. The reversal of 1121521221449 is 9441221251211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097455284025 + 24065937424 = 1047595^2 + 155132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121521221449 - 2¹⁶ = 1121521155913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121521281449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560760610724 + 560760610725.

It is an arithmetic number, because the mean of its divisors is an integer number (560760610725).

Almost surely, 2^{1121521221449} is an apocalyptic number.

It is an amenable number.

1121521221449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121521221449 is an equidigital number, since it uses as much as digits as its factorization.

1121521221449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 35.

The spelling of 1121521221449 in words is "one trillion, one hundred twenty-one billion, five hundred twenty-one million, two hundred twenty-one thousand, four hundred forty-nine".