12001321 has 4 divisors (see below), whose sum is σ = 12028500. Its totient is φ = 11974144.

The previous prime is 12001307. The next prime is 12001333. The reversal of 12001321 is 12310021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 4515625 = 2736^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001321 - 2⁵ = 12001289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001298 and 12001307.

It is not an unprimeable number, because it can be changed into a prime (12001361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12916 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (3007125).

Almost surely, 2^12001321 is an apocalyptic number.

It is an amenable number.

12001321 is a deficient number, since it is larger than the sum of its proper divisors (27179).

12001321 is an equidigital number, since it uses as much as digits as its factorization.

12001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27178.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 12001321 is about 3464.2922798170. The cubic root of 12001321 is about 228.9512491331.

Adding to 12001321 its reverse (12310021), we get a palindrome (24311342).

The spelling of 12001321 in words is "twelve million, one thousand, three hundred twenty-one".