11666321 has 4 divisors (see below), whose sum is σ = 11697972. Its totient is φ = 11634672.

The previous prime is 11666299. The next prime is 11666327. The reversal of 11666321 is 12366611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12366611 = 1373 ⋅9007.

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 5107600 = 2561^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666321 - 2⁶ = 11666257 is a prime.

It is a super-2 number, since 2×11666321² = 272206091350082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11666327) 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, 15266 + ... + 16011.

It is an arithmetic number, because the mean of its divisors is an integer number (2924493).

Almost surely, 2^11666321 is an apocalyptic number.

It is an amenable number.

11666321 is a deficient number, since it is larger than the sum of its proper divisors (31651).

11666321 is an equidigital number, since it uses as much as digits as its factorization.

11666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31650.

The product of its digits is 1296, while the sum is 26.

The square root of 11666321 is about 3415.5996545263. The cubic root of 11666321 is about 226.8008305593.

The spelling of 11666321 in words is "eleven million, six hundred sixty-six thousand, three hundred twenty-one".