12783321 has 6 divisors (see below), whose sum is σ = 18464810. Its totient is φ = 8522208.

The previous prime is 12783319. The next prime is 12783347. The reversal of 12783321 is 12338721.

12783321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 81225 = 3564^2 + 285^2 .

It is not a de Polignac number, because 12783321 - 2¹ = 12783319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12783361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710176 + ... + 710193.

Almost surely, 2^12783321 is an apocalyptic number.

It is an amenable number.

12783321 is a deficient number, since it is larger than the sum of its proper divisors (5681489).

12783321 is a wasteful number, since it uses less digits than its factorization.

12783321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420375 (or 1420372 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12783321 is about 3575.3770430543. The cubic root of 12783321 is about 233.8197713690.

The spelling of 12783321 in words is "twelve million, seven hundred eighty-three thousand, three hundred twenty-one".