13220111312 has 10 divisors (see below), whose sum is σ = 25613965698. Its totient is φ = 6610055648.

The previous prime is 13220111287. The next prime is 13220111363. The reversal of 13220111312 is 21311102231.

It can be written as a sum of positive squares in only one way, i.e., 10490675776 + 2729435536 = 102424^2 + 52244^2 .

It is a super-2 number, since 2×13220111312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413128463 + ... + 413128494.

Almost surely, 2^13220111312 is an apocalyptic number.

It is an amenable number.

13220111312 is a deficient number, since it is larger than the sum of its proper divisors (12393854386).

13220111312 is an equidigital number, since it uses as much as digits as its factorization.

13220111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826256965 (or 826256959 counting only the distinct ones).

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

Adding to 13220111312 its reverse (21311102231), we get a palindrome (34531213543).

The spelling of 13220111312 in words is "thirteen billion, two hundred twenty million, one hundred eleven thousand, three hundred twelve".