11640221312 has 32 divisors (see below), whose sum is σ = 23816256420. Its totient is φ = 5662808064.

The previous prime is 11640221293. The next prime is 11640221323. The reversal of 11640221312 is 21312204611.

It can be written as a sum of positive squares in 2 ways, for example, as 11469553216 + 170668096 = 107096^2 + 13064^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1224173 + ... + 1233644.

Almost surely, 2^11640221312 is an apocalyptic number.

It is an amenable number.

11640221312 is an abundant number, since it is smaller than the sum of its proper divisors (12176035108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11640221312 is an equidigital number, since it uses as much as digits as its factorization.

11640221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457868 (or 2457856 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 11640221312 its reverse (21312204611), we get a palindrome (32952425923).

The spelling of 11640221312 in words is "eleven billion, six hundred forty million, two hundred twenty-one thousand, three hundred twelve".