21020110211 has 2 divisors, whose sum is σ = 21020110212. Its totient is φ = 21020110210.

The previous prime is 21020110193. The next prime is 21020110213. The reversal of 21020110211 is 11201102012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020110211 - 2⁶ = 21020110147 is a prime.

Together with 21020110213, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020110192 and 21020110201.

It is not a weakly prime, because it can be changed into another prime (21020110213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510055105 + 10510055106.

It is an arithmetic number, because the mean of its divisors is an integer number (10510055106).

Almost surely, 2^21020110211 is an apocalyptic number.

21020110211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020110211 is an equidigital number, since it uses as much as digits as its factorization.

21020110211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21020110211 its reverse (11201102012), we get a palindrome (32221212223).

The spelling of 21020110211 in words is "twenty-one billion, twenty million, one hundred ten thousand, two hundred eleven".