12213331 has 4 divisors (see below), whose sum is σ = 13152832. Its totient is φ = 11273832.

The previous prime is 12213329. The next prime is 12213347. The reversal of 12213331 is 13331221.

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 12213331 - 2¹ = 12213329 is a prime.

It is a super-2 number, since 2×12213331² = 298330908231122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469731 + ... + 469756.

It is an arithmetic number, because the mean of its divisors is an integer number (3288208).

Almost surely, 2^12213331 is an apocalyptic number.

12213331 is a deficient number, since it is larger than the sum of its proper divisors (939501).

12213331 is an equidigital number, since it uses as much as digits as its factorization.

12213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939500.

The product of its digits is 108, while the sum is 16.

The square root of 12213331 is about 3494.7576453883. The cubic root of 12213331 is about 230.2915709880.

Adding to 12213331 its reverse (13331221), we get a palindrome (25544552).

It can be divided in two parts, 12213 and 331, that added together give a square (12544 = 112²).

The spelling of 12213331 in words is "twelve million, two hundred thirteen thousand, three hundred thirty-one".