20116021 has 2 divisors, whose sum is σ = 20116022. Its totient is φ = 20116020.

The previous prime is 20116001. The next prime is 20116039. The reversal of 20116021 is 12061102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 3802500 = 4039^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 20116021 - 2⁵ = 20115989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20115992 and 20116010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116001) 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, 10058010 + 10058011.

It is an arithmetic number, because the mean of its divisors is an integer number (10058011).

Almost surely, 2^20116021 is an apocalyptic number.

It is an amenable number.

20116021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116021 is an equidigital number, since it uses as much as digits as its factorization.

20116021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20116021 is about 4485.0887393674. The cubic root of 20116021 is about 271.9656323720.

Adding to 20116021 its reverse (12061102), we get a palindrome (32177123).

The spelling of 20116021 in words is "twenty million, one hundred sixteen thousand, twenty-one".