12212321 has 8 divisors (see below), whose sum is σ = 13368864. Its totient is φ = 11063520.

The previous prime is 12212311. The next prime is 12212327. The reversal of 12212321 is 12321221.

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 a de Polignac number, because none of the positive numbers 2^k-12212321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212296 and 12212305.

It is not an unprimeable number, because it can be changed into a prime (12212327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (1671108).

Almost surely, 2^12212321 is an apocalyptic number.

12212321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212321 is a deficient number, since it is larger than the sum of its proper divisors (1156543).

12212321 is a wasteful number, since it uses less digits than its factorization.

12212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871.

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

The square root of 12212321 is about 3494.6131402489. The cubic root of 12212321 is about 230.2852227090.

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

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

The spelling of 12212321 in words is "twelve million, two hundred twelve thousand, three hundred twenty-one".