12211213321 has 4 divisors (see below), whose sum is σ = 12220600644. Its totient is φ = 12201826000.

The previous prime is 12211213279. The next prime is 12211213331. The reversal of 12211213321 is 12331211221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12331211221 = 7 ⋅1761601603.

It can be written as a sum of positive squares in 2 ways, for example, as 5194805625 + 7016407696 = 72075^2 + 83764^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211213321 - 2¹³ = 12211205129 is a prime.

It is a super-2 number, since 2×12211213321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211213331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4691710 + ... + 4694311.

It is an arithmetic number, because the mean of its divisors is an integer number (3055150161).

Almost surely, 2^12211213321 is an apocalyptic number.

It is an amenable number.

12211213321 is a deficient number, since it is larger than the sum of its proper divisors (9387323).

12211213321 is an equidigital number, since it uses as much as digits as its factorization.

12211213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9387322.

The product of its digits is 144, while the sum is 19.

Adding to 12211213321 its reverse (12331211221), we get a palindrome (24542424542).

The spelling of 12211213321 in words is "twelve billion, two hundred eleven million, two hundred thirteen thousand, three hundred twenty-one".