12021857 has 2 divisors, whose sum is σ = 12021858. Its totient is φ = 12021856.

The previous prime is 12021817. The next prime is 12021869. The reversal of 12021857 is 75812021.

12021857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10086976 + 1934881 = 3176^2 + 1391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12021817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010928 + 6010929.

It is an arithmetic number, because the mean of its divisors is an integer number (6010929).

Almost surely, 2^12021857 is an apocalyptic number.

It is an amenable number.

12021857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021857 is an equidigital number, since it uses as much as digits as its factorization.

12021857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12021857 is about 3467.2549661079. The cubic root of 12021857 is about 229.0817643103.

Adding to 12021857 its reverse (75812021), we get a palindrome (87833878).

The spelling of 12021857 in words is "twelve million, twenty-one thousand, eight hundred fifty-seven".