12021001 has 2 divisors, whose sum is σ = 12021002.
Its totient is φ = 12021000.
The previous prime is 12020947. The next prime is 12021007. The reversal of 12021001 is 10012021.
Adding to 12021001 its reverse (10012021), we get a palindrome (22033022).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 6375625 + 5645376 = 2525^2 + 2376^2
It is an emirp because it is prime and its reverse (10012021) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 12021001 - 211 = 12018953 is a prime.
It is not a weakly prime, because it can be changed into another prime (12021007) 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, 6010500 + 6010501.
It is an arithmetic number, because the mean of its divisors is an integer number (6010501).
Almost surely, 212021001 is an apocalyptic number.
It is an amenable number.
12021001 is a deficient number, since it is larger than the sum of its proper divisors (1).
12021001 is an equidigital number, since it uses as much as digits as its factorization.
12021001 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 12021001 is about 3467.1315233201.
The cubic root of 12021001 is about 229.0763270292.
The spelling of 12021001 in words is "twelve million, twenty-one thousand, one".