21202010201 has 2 divisors, whose sum is σ = 21202010202. Its totient is φ = 21202010200.

The previous prime is 21202010191. The next prime is 21202010209. The reversal of 21202010201 is 10201020212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20477323801 + 724686400 = 143099^2 + 26920^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202010201 - 2³⁴ = 4022141017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202010209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601005100 + 10601005101.

It is an arithmetic number, because the mean of its divisors is an integer number (10601005101).

Almost surely, 2^21202010201 is an apocalyptic number.

It is an amenable number.

21202010201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202010201 is an equidigital number, since it uses as much as digits as its factorization.

21202010201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21202010201 its reverse (10201020212), we get a palindrome (31403030413).

The spelling of 21202010201 in words is "twenty-one billion, two hundred two million, ten thousand, two hundred one".