11356116521 has 2 divisors, whose sum is σ = 11356116522. Its totient is φ = 11356116520.

The previous prime is 11356116511. The next prime is 11356116539. The reversal of 11356116521 is 12561165311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10406244121 + 949872400 = 102011^2 + 30820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11356116521 is a prime.

It is a super-2 number, since 2×11356116521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11356116511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5678058260 + 5678058261.

It is an arithmetic number, because the mean of its divisors is an integer number (5678058261).

Almost surely, 2^11356116521 is an apocalyptic number.

It is an amenable number.

11356116521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11356116521 is an equidigital number, since it uses as much as digits as its factorization.

11356116521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The spelling of 11356116521 in words is "eleven billion, three hundred fifty-six million, one hundred sixteen thousand, five hundred twenty-one".