12321221 has 8 divisors (see below), whose sum is σ = 13469088. Its totient is φ = 11178000.

The previous prime is 12321193. The next prime is 12321223. The reversal of 12321221 is 12212321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12321221 - 2¹⁰ = 12320197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12321196 and 12321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6791 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (1683636).

Almost surely, 2^12321221 is an apocalyptic number.

12321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12321221 is a deficient number, since it is larger than the sum of its proper divisors (1147867).

12321221 is a wasteful number, since it uses less digits than its factorization.

12321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323.

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

The square root of 12321221 is about 3510.1596829774. The cubic root of 12321221 is about 230.9676997371.

Adding to 12321221 its reverse (12212321), we get a palindrome (24533542).

Subtracting from 12321221 its reverse (12212321), we obtain a square (108900 = 330²).

The spelling of 12321221 in words is "twelve million, three hundred twenty-one thousand, two hundred twenty-one".