11126136521 has 4 divisors (see below), whose sum is σ = 11174722500. Its totient is φ = 11077550544.

The previous prime is 11126136443. The next prime is 11126136551. The reversal of 11126136521 is 12563162111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12563162111 = 6691 ⋅1877621.

It can be written as a sum of positive squares in 2 ways, for example, as 7986103225 + 3140033296 = 89365^2 + 56036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11126136521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11126136551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24292646 + ... + 24293103.

It is an arithmetic number, because the mean of its divisors is an integer number (2793680625).

Almost surely, 2^11126136521 is an apocalyptic number.

It is an amenable number.

11126136521 is a deficient number, since it is larger than the sum of its proper divisors (48585979).

11126136521 is an equidigital number, since it uses as much as digits as its factorization.

11126136521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48585978.

The product of its digits is 2160, while the sum is 29.

Adding to 11126136521 its reverse (12563162111), we get a palindrome (23689298632).

The spelling of 11126136521 in words is "eleven billion, one hundred twenty-six million, one hundred thirty-six thousand, five hundred twenty-one".