11172836521 has 16 divisors (see below), whose sum is σ = 14086293120. Its totient is φ = 8608279680.

The previous prime is 11172836503. The next prime is 11172836533. The reversal of 11172836521 is 12563827111.

It is not a de Polignac number, because 11172836521 - 2⁹ = 11172836009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172836581) 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, 808326 + ... + 822031.

It is an arithmetic number, because the mean of its divisors is an integer number (880393320).

Almost surely, 2^11172836521 is an apocalyptic number.

11172836521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11172836521 is a deficient number, since it is larger than the sum of its proper divisors (2913456599).

11172836521 is a wasteful number, since it uses less digits than its factorization.

11172836521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630464.

The product of its digits is 20160, while the sum is 37.

The spelling of 11172836521 in words is "eleven billion, one hundred seventy-two million, eight hundred thirty-six thousand, five hundred twenty-one".