11231320156 has 48 divisors (see below), whose sum is σ = 23059235584. Its totient is φ = 4686304896.

The previous prime is 11231320073. The next prime is 11231320157. The reversal of 11231320156 is 65102313211.

It is a happy number.

It is a super-2 number, since 2×11231320156² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11231320156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231320157) 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, 361951 + ... + 391753.

Almost surely, 2^11231320156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11231320156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11529617792).

11231320156 is an abundant number, since it is smaller than the sum of its proper divisors (11827915428).

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

11231320156 is a wasteful number, since it uses less digits than its factorization.

11231320156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30170 (or 30168 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 11231320156 its reverse (65102313211), we get a palindrome (76333633367).

The spelling of 11231320156 in words is "eleven billion, two hundred thirty-one million, three hundred twenty thousand, one hundred fifty-six".