21020202011101 has 2 divisors, whose sum is σ = 21020202011102. Its totient is φ = 21020202011100.

The previous prime is 21020202011099. The next prime is 21020202011113. The reversal of 21020202011101 is 10111020202012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21007234723225 + 12967287876 = 4583365^2 + 113874^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020202011101 - 2¹ = 21020202011099 is a prime.

Together with 21020202011099, 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 (21020202011401) 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, 10510101005550 + 10510101005551.

It is an arithmetic number, because the mean of its divisors is an integer number (10510101005551).

Almost surely, 2^{21020202011101} is an apocalyptic number.

It is an amenable number.

21020202011101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020202011101 is an equidigital number, since it uses as much as digits as its factorization.

21020202011101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020202011101 its reverse (10111020202012), we get a palindrome (31131222213113).

The spelling of 21020202011101 in words is "twenty-one trillion, twenty billion, two hundred two million, eleven thousand, one hundred one".