11211231320 has 64 divisors (see below), whose sum is σ = 26351075520. Its totient is φ = 4284780544.

The previous prime is 11211231319. The next prime is 11211231329. The reversal of 11211231320 is 2313211211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211231329) 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, 892604 + ... + 905076.

It is an arithmetic number, because the mean of its divisors is an integer number (411735555).

Almost surely, 2^11211231320 is an apocalyptic number.

11211231320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11211231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13175537760).

11211231320 is an abundant number, since it is smaller than the sum of its proper divisors (15139844200).

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

11211231320 is a wasteful number, since it uses less digits than its factorization.

11211231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13484 (or 13480 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11211231320 its reverse (2313211211), we get a palindrome (13524442531).

The spelling of 11211231320 in words is "eleven billion, two hundred eleven million, two hundred thirty-one thousand, three hundred twenty".