13220313312 has 24 divisors (see below), whose sum is σ = 34703322696. Its totient is φ = 4406771072.

The previous prime is 13220313277. The next prime is 13220313319. The reversal of 13220313312 is 21331302231.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220313319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68855703 + ... + 68855894.

It is an arithmetic number, because the mean of its divisors is an integer number (1445971779).

Almost surely, 2^13220313312 is an apocalyptic number.

13220313312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13220313312 is an abundant number, since it is smaller than the sum of its proper divisors (21483009384).

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

13220313312 is a wasteful number, since it uses less digits than its factorization.

13220313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137711610 (or 137711602 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13220313312 its reverse (21331302231), we get a palindrome (34551615543).

The spelling of 13220313312 in words is "thirteen billion, two hundred twenty million, three hundred thirteen thousand, three hundred twelve".