11906021 has 2 divisors, whose sum is σ = 11906022. Its totient is φ = 11906020.

The previous prime is 11906003. The next prime is 11906047. The reversal of 11906021 is 12060911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7236100 + 4669921 = 2690^2 + 2161^2 .

It is an emirp because it is prime and its reverse (12060911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11906021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11905984 and 11906002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11906051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5953010 + 5953011.

It is an arithmetic number, because the mean of its divisors is an integer number (5953011).

Almost surely, 2^11906021 is an apocalyptic number.

It is an amenable number.

11906021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11906021 is an equidigital number, since it uses as much as digits as its factorization.

11906021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 11906021 is about 3450.5102521221. The cubic root of 11906021 is about 228.3436198088.

Adding to 11906021 its reverse (12060911), we get a palindrome (23966932).

The spelling of 11906021 in words is "eleven million, nine hundred six thousand, twenty-one".