12221321 has 16 divisors (see below), whose sum is σ = 14488320. Its totient is φ = 10091520.

The previous prime is 12221273. The next prime is 12221327. The reversal of 12221321 is 12312221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12221321 - 2²² = 8027017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221296 and 12221305.

It is not an unprimeable number, because it can be changed into a prime (12221327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27620 + ... + 28058.

It is an arithmetic number, because the mean of its divisors is an integer number (905520).

Almost surely, 2^12221321 is an apocalyptic number.

It is an amenable number.

12221321 is a deficient number, since it is larger than the sum of its proper divisors (2266999).

12221321 is an equidigital number, since it uses as much as digits as its factorization.

12221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its digits is 48, while the sum is 14.

The square root of 12221321 is about 3495.9005992734. The cubic root of 12221321 is about 230.3417792003.

Adding to 12221321 its reverse (12312221), we get a palindrome (24533542).

The spelling of 12221321 in words is "twelve million, two hundred twenty-one thousand, three hundred twenty-one".