11668021 has 2 divisors, whose sum is σ = 11668022. Its totient is φ = 11668020.

The previous prime is 11668009. The next prime is 11668043. The reversal of 11668021 is 12086611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 579121 = 3330^2 + 761^2 .

It is an emirp because it is prime and its reverse (12086611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11668021 - 2¹⁹ = 11143733 is a prime.

It is a super-2 number, since 2×11668021² = 272285428112882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11660021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5834010 + 5834011.

It is an arithmetic number, because the mean of its divisors is an integer number (5834011).

Almost surely, 2^11668021 is an apocalyptic number.

It is an amenable number.

11668021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11668021 is an equidigital number, since it uses as much as digits as its factorization.

11668021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 11668021 is about 3415.8485036664. The cubic root of 11668021 is about 226.8118463910.

The spelling of 11668021 in words is "eleven million, six hundred sixty-eight thousand, twenty-one".