21011010211 has 2 divisors, whose sum is σ = 21011010212. Its totient is φ = 21011010210.

The previous prime is 21011010193. The next prime is 21011010239. The reversal of 21011010211 is 11201011012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011010211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011010011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505505105 + 10505505106.

It is an arithmetic number, because the mean of its divisors is an integer number (10505505106).

Almost surely, 2^21011010211 is an apocalyptic number.

21011010211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011010211 is an equidigital number, since it uses as much as digits as its factorization.

21011010211 is an evil number, because the sum of its binary digits is even.

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

Adding to 21011010211 its reverse (11201011012), we get a palindrome (32212021223).

The spelling of 21011010211 in words is "twenty-one billion, eleven million, ten thousand, two hundred eleven".