11521687133 has 16 divisors (see below), whose sum is σ = 12741333696. Its totient is φ = 10331591040.

The previous prime is 11521687127. The next prime is 11521687141. The reversal of 11521687133 is 33178612511.

It is a cyclic number.

It is not a de Polignac number, because 11521687133 - 2¹⁶ = 11521621597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521687103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253235 + ... + 295247.

It is an arithmetic number, because the mean of its divisors is an integer number (796333356).

Almost surely, 2^11521687133 is an apocalyptic number.

It is an amenable number.

11521687133 is a deficient number, since it is larger than the sum of its proper divisors (1219646563).

11521687133 is a wasteful number, since it uses less digits than its factorization.

11521687133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42364.

The product of its digits is 30240, while the sum is 38.

The spelling of 11521687133 in words is "eleven billion, five hundred twenty-one million, six hundred eighty-seven thousand, one hundred thirty-three".