12011321 has 6 divisors (see below), whose sum is σ = 13972410. Its totient is φ = 10295376.

The previous prime is 12011317. The next prime is 12011323. The reversal of 12011321 is 12311021.

It can be written as a sum of positive squares in only one way, i.e., 9486400 + 2524921 = 3080^2 + 1589^2 .

It is not a de Polignac number, because 12011321 - 2² = 12011317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011323) 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, 122516 + ... + 122613.

It is an arithmetic number, because the mean of its divisors is an integer number (2328735).

Almost surely, 2^12011321 is an apocalyptic number.

It is an amenable number.

12011321 is a deficient number, since it is larger than the sum of its proper divisors (1961089).

12011321 is an equidigital number, since it uses as much as digits as its factorization.

12011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245143 (or 245136 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12011321 is about 3465.7352755224. The cubic root of 12011321 is about 229.0148220481.

Adding to 12011321 its reverse (12311021), we get a palindrome (24322342).

The spelling of 12011321 in words is "twelve million, eleven thousand, three hundred twenty-one".