12010021 has 2 divisors, whose sum is σ = 12010022. Its totient is φ = 12010020.

The previous prime is 12010013. The next prime is 12010027. The reversal of 12010021 is 12001021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 1185921 = 3290^2 + 1089^2 .

It is an emirp because it is prime and its reverse (12001021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12010021 - 2³ = 12010013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12009986 and 12010013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12010027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005010 + 6005011.

It is an arithmetic number, because the mean of its divisors is an integer number (6005011).

Almost surely, 2^12010021 is an apocalyptic number.

It is an amenable number.

12010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12010021 is an equidigital number, since it uses as much as digits as its factorization.

12010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 12010021 is about 3465.5477200581. The cubic root of 12010021 is about 229.0065595650.

Adding to 12010021 its reverse (12001021), we get a palindrome (24011042).

The spelling of 12010021 in words is "twelve million, ten thousand, twenty-one".