12213321 has 16 divisors (see below), whose sum is σ = 17068800. Its totient is φ = 7757568.

The previous prime is 12213319. The next prime is 12213329. The reversal of 12213321 is 12331221.

12213321 = T₁₆₆ + T₁₆₇ + ... + T₄₂₆.

12213321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12213321 - 2¹ = 12213319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12213321.

It is not an unprimeable number, because it can be changed into a prime (12213329) 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, 5985 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (1066800).

Almost surely, 2^12213321 is an apocalyptic number.

It is an amenable number.

12213321 is a deficient number, since it is larger than the sum of its proper divisors (4855479).

12213321 is a wasteful number, since it uses less digits than its factorization.

12213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888.

The product of its digits is 72, while the sum is 15.

The square root of 12213321 is about 3494.7562146736. The cubic root of 12213321 is about 230.2915081355.

Adding to 12213321 its reverse (12331221), we get a palindrome (24544542).

The spelling of 12213321 in words is "twelve million, two hundred thirteen thousand, three hundred twenty-one".