200105021 has 2 divisors, whose sum is σ = 200105022. Its totient is φ = 200105020.

The previous prime is 200104999. The next prime is 200105027. The reversal of 200105021 is 120501002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198105625 + 1999396 = 14075^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 200105021 - 2¹⁰ = 200103997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 200104993 and 200105011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200105027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100052510 + 100052511.

It is an arithmetic number, because the mean of its divisors is an integer number (100052511).

Almost surely, 2^200105021 is an apocalyptic number.

It is an amenable number.

200105021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200105021 is an equidigital number, since it uses as much as digits as its factorization.

200105021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 200105021 is about 14145.8481894866. The cubic root of 200105021 is about 584.9058908200.

Adding to 200105021 its reverse (120501002), we get a palindrome (320606023).

The spelling of 200105021 in words is "two hundred million, one hundred five thousand, twenty-one".