11236560721 has 2 divisors, whose sum is σ = 11236560722. Its totient is φ = 11236560720.

The previous prime is 11236560637. The next prime is 11236560773. The reversal of 11236560721 is 12706563211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11048322321 + 188238400 = 105111^2 + 13720^2 .

It is a cyclic number.

It is not a de Polignac number, because 11236560721 - 2¹⁷ = 11236429649 is a prime.

It is not a weakly prime, because it can be changed into another prime (11236560791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5618280360 + 5618280361.

It is an arithmetic number, because the mean of its divisors is an integer number (5618280361).

Almost surely, 2^11236560721 is an apocalyptic number.

It is an amenable number.

11236560721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11236560721 is an equidigital number, since it uses as much as digits as its factorization.

11236560721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 11236560721 in words is "eleven billion, two hundred thirty-six million, five hundred sixty thousand, seven hundred twenty-one".