21101010211 has 2 divisors, whose sum is σ = 21101010212. Its totient is φ = 21101010210.

The previous prime is 21101010209. The next prime is 21101010233. The reversal of 21101010211 is 11201010112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101010211 - 2¹ = 21101010209 is a prime.

Together with 21101010209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21101010241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550505105 + 10550505106.

It is an arithmetic number, because the mean of its divisors is an integer number (10550505106).

Almost surely, 2^21101010211 is an apocalyptic number.

21101010211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101010211 is an equidigital number, since it uses as much as digits as its factorization.

21101010211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21101010211 its reverse (11201010112), we get a palindrome (32302020323).

Subtracting from 21101010211 its reverse (11201010112), we obtain a palindrome (9900000099).

The spelling of 21101010211 in words is "twenty-one billion, one hundred one million, ten thousand, two hundred eleven".