12221311 has 4 divisors (see below), whose sum is σ = 12233872. Its totient is φ = 12208752.

The previous prime is 12221273. The next prime is 12221327. The reversal of 12221311 is 11312221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12221311 - 2¹⁵ = 12188543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221291 and 12221300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221371) 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, 4686 + ... + 6811.

It is an arithmetic number, because the mean of its divisors is an integer number (3058468).

Almost surely, 2^12221311 is an apocalyptic number.

12221311 is a deficient number, since it is larger than the sum of its proper divisors (12561).

12221311 is a wasteful number, since it uses less digits than its factorization.

12221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560.

The product of its digits is 24, while the sum is 13.

The square root of 12221311 is about 3495.8991690265. The cubic root of 12221311 is about 230.3417163752.

Adding to 12221311 its reverse (11312221), we get a palindrome (23533532).

The spelling of 12221311 in words is "twelve million, two hundred twenty-one thousand, three hundred eleven".