12212213121 has 12 divisors (see below), whose sum is σ = 18568277520. Its totient is φ = 7712976600.

The previous prime is 12212213099. The next prime is 12212213173. The reversal of 12212213121 is 12131221221.

It is not a de Polignac number, because 12212213121 - 2⁵ = 12212213089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212213094 and 12212213103.

It is not an unprimeable number, because it can be changed into a prime (12212213921) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 35708055 + ... + 35708396.

It is an arithmetic number, because the mean of its divisors is an integer number (1547356460).

Almost surely, 2^12212213121 is an apocalyptic number.

It is an amenable number.

12212213121 is a deficient number, since it is larger than the sum of its proper divisors (6356064399).

12212213121 is a wasteful number, since it uses less digits than its factorization.

12212213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71416476 (or 71416473 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 12212213121 its reverse (12131221221), we get a palindrome (24343434342).

The spelling of 12212213121 in words is "twelve billion, two hundred twelve million, two hundred thirteen thousand, one hundred twenty-one".