12021817 has 2 divisors, whose sum is σ = 12021818. Its totient is φ = 12021816.

The previous prime is 12021809. The next prime is 12021857. The reversal of 12021817 is 71812021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6170256 + 5851561 = 2484^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021817 - 2³ = 12021809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12021857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010908 + 6010909.

It is an arithmetic number, because the mean of its divisors is an integer number (6010909).

Almost surely, 2^12021817 is an apocalyptic number.

It is an amenable number.

12021817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021817 is an equidigital number, since it uses as much as digits as its factorization.

12021817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 12021817 is about 3467.2491978512. The cubic root of 12021817 is about 229.0815102374.

Adding to 12021817 its reverse (71812021), we get a palindrome (83833838).

The spelling of 12021817 in words is "twelve million, twenty-one thousand, eight hundred seventeen".