12213112221 has 6 divisors (see below), whose sum is σ = 17641162110. Its totient is φ = 8142074808.

The previous prime is 12213112169. The next prime is 12213112319. The reversal of 12213112221 is 12221131221.

It can be written as a sum of positive squares in only one way, i.e., 11390225625 + 822886596 = 106725^2 + 28686^2 .

It is not a de Polignac number, because 12213112221 - 2¹⁴ = 12213095837 is a prime.

It is a super-2 number, since 2×12213112221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12213112194 and 12213112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213152221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 678506226 + ... + 678506243.

It is an arithmetic number, because the mean of its divisors is an integer number (2940193685).

Almost surely, 2^12213112221 is an apocalyptic number.

It is an amenable number.

12213112221 is a deficient number, since it is larger than the sum of its proper divisors (5428049889).

12213112221 is a wasteful number, since it uses less digits than its factorization.

12213112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357012475 (or 1357012472 counting only the distinct ones).

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

Adding to 12213112221 its reverse (12221131221), we get a palindrome (24434243442).

The spelling of 12213112221 in words is "twelve billion, two hundred thirteen million, one hundred twelve thousand, two hundred twenty-one".