12222222221 has 24 divisors (see below), whose sum is σ = 13814312064. Its totient is φ = 10798920000.

The previous prime is 12222222197. The next prime is 12222222253.

12222222221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12222222221 - 2¹⁴ = 12222205837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222222193 and 12222222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222222281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1339886 + ... + 1348976.

It is an arithmetic number, because the mean of its divisors is an integer number (575596336).

Almost surely, 2^12222222221 is an apocalyptic number.

12222222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222222221 is a deficient number, since it is larger than the sum of its proper divisors (1592089843).

12222222221 is a wasteful number, since it uses less digits than its factorization.

12222222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9425 (or 9414 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

It can be divided in two parts, 1 and 2222222221, that added together give a palindrome (2222222222).

The spelling of 12222222221 in words is "twelve billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".