11449709887921 has 2 divisors, whose sum is σ = 11449709887922. Its totient is φ = 11449709887920.

The previous prime is 11449709887871. The next prime is 11449709887951. The reversal of 11449709887921 is 12978890794411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9724792771600 + 1724917116321 = 3118460^2 + 1313361^2 .

It is a cyclic number.

It is not a de Polignac number, because 11449709887921 - 2²⁵ = 11449676333489 is a prime.

It is not a weakly prime, because it can be changed into another prime (11449709887951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5724854943960 + 5724854943961.

It is an arithmetic number, because the mean of its divisors is an integer number (5724854943961).

Almost surely, 2^{11449709887921} is an apocalyptic number.

It is an amenable number.

11449709887921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11449709887921 is an equidigital number, since it uses as much as digits as its factorization.

11449709887921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 11449709887921 in words is "eleven trillion, four hundred forty-nine billion, seven hundred nine million, eight hundred eighty-seven thousand, nine hundred twenty-one".