21010221101101 has 2 divisors, whose sum is σ = 21010221101102. Its totient is φ = 21010221101100.

The previous prime is 21010221101099. The next prime is 21010221101117. The reversal of 21010221101101 is 10110112201012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10755021865225 + 10255199235876 = 3279485^2 + 3202374^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010221101101 - 2¹ = 21010221101099 is a prime.

Together with 21010221101099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010221105101) 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, 10505110550550 + 10505110550551.

It is an arithmetic number, because the mean of its divisors is an integer number (10505110550551).

Almost surely, 2^{21010221101101} is an apocalyptic number.

It is an amenable number.

21010221101101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010221101101 is an equidigital number, since it uses as much as digits as its factorization.

21010221101101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21010221101101 its reverse (10110112201012), we get a palindrome (31120333302113).

The spelling of 21010221101101 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, one hundred one thousand, one hundred one".