11121320257 has 2 divisors, whose sum is σ = 11121320258. Its totient is φ = 11121320256.

The previous prime is 11121320191. The next prime is 11121320263. The reversal of 11121320257 is 75202312111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8479463056 + 2641857201 = 92084^2 + 51399^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121320257 - 2⁷ = 11121320129 is a prime.

It is not a weakly prime, because it can be changed into another prime (11121320297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560660128 + 5560660129.

It is an arithmetic number, because the mean of its divisors is an integer number (5560660129).

Almost surely, 2^11121320257 is an apocalyptic number.

It is an amenable number.

11121320257 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121320257 is an equidigital number, since it uses as much as digits as its factorization.

11121320257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 11121320257 its reverse (75202312111), we get a palindrome (86323632368).

The spelling of 11121320257 in words is "eleven billion, one hundred twenty-one million, three hundred twenty thousand, two hundred fifty-seven".