12213121113 has 20 divisors (see below), whose sum is σ = 19317487860. Its totient is φ = 7663133952.

The previous prime is 12213121111. The next prime is 12213121211. The reversal of 12213121113 is 31112131221.

It can be written as a sum of positive squares in 2 ways, for example, as 10809345024 + 1403776089 = 103968^2 + 37467^2 .

It is not a de Polignac number, because 12213121113 - 2¹ = 12213121111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12213121111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4433308 + ... + 4436061.

It is an arithmetic number, because the mean of its divisors is an integer number (965874393).

Almost surely, 2^12213121113 is an apocalyptic number.

It is an amenable number.

12213121113 is a deficient number, since it is larger than the sum of its proper divisors (7104366747).

12213121113 is an equidigital number, since it uses as much as digits as its factorization.

12213121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8869398 (or 8869389 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 12213121113 its reverse (31112131221), we get a palindrome (43325252334).

The spelling of 12213121113 in words is "twelve billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred thirteen".