21202002212101 has 2 divisors, whose sum is σ = 21202002212102. Its totient is φ = 21202002212100.

The previous prime is 21202002212071. The next prime is 21202002212129. The reversal of 21202002212101 is 10121220020212.

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., 14410109484225 + 6791892727876 = 3796065^2 + 2606126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202002212101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202002222101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601001106050 + 10601001106051.

It is an arithmetic number, because the mean of its divisors is an integer number (10601001106051).

Almost surely, 2^{21202002212101} is an apocalyptic number.

It is an amenable number.

21202002212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202002212101 is an equidigital number, since it uses as much as digits as its factorization.

21202002212101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202002212101 its reverse (10121220020212), we get a palindrome (31323222232313).

The spelling of 21202002212101 in words is "twenty-one trillion, two hundred two billion, two million, two hundred twelve thousand, one hundred one".