12213231221 has 6 divisors (see below), whose sum is σ = 12423747222. Its totient is φ = 12006223880.

The previous prime is 12213231193. The next prime is 12213231223.

12213231221 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 10917951121 + 1295280100 = 104489^2 + 35990^2 .

It is not a de Polignac number, because 12213231221 - 2⁶ = 12213231157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213231193 and 12213231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213231223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1750790 + ... + 1757751.

It is an arithmetic number, because the mean of its divisors is an integer number (2070624537).

Almost surely, 2^12213231221 is an apocalyptic number.

It is an amenable number.

12213231221 is a deficient number, since it is larger than the sum of its proper divisors (210516001).

12213231221 is an frugal number, since it uses more digits than its factorization.

12213231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508659 (or 3508600 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The spelling of 12213231221 in words is "twelve billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-one".