12213030312 has 128 divisors (see below), whose sum is σ = 39250579200. Its totient is φ = 3489402240.

The previous prime is 12213030307. The next prime is 12213030329. The reversal of 12213030312 is 21303031221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72612 + ... + 172332.

It is an arithmetic number, because the mean of its divisors is an integer number (306645150).

Almost surely, 2^12213030312 is an apocalyptic number.

12213030312 is a gapful number since it is divisible by the number (12) 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 12213030312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19625289600).

12213030312 is an abundant number, since it is smaller than the sum of its proper divisors (27037548888).

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

12213030312 is an frugal number, since it uses more digits than its factorization.

12213030312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99755 (or 99733 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 12213030312 its reverse (21303031221), we get a palindrome (33516061533).

Subtracting 12213030312 from its reverse (21303031221), we obtain a palindrome (9090000909).

The spelling of 12213030312 in words is "twelve billion, two hundred thirteen million, thirty thousand, three hundred twelve".