21210214211 has 2 divisors, whose sum is σ = 21210214212. Its totient is φ = 21210214210.

The previous prime is 21210214199. The next prime is 21210214217. The reversal of 21210214211 is 11241201212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210214211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210214211.

It is not a weakly prime, because it can be changed into another prime (21210214217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605107105 + 10605107106.

It is an arithmetic number, because the mean of its divisors is an integer number (10605107106).

Almost surely, 2^21210214211 is an apocalyptic number.

21210214211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210214211 is an equidigital number, since it uses as much as digits as its factorization.

21210214211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210214211 its reverse (11241201212), we get a palindrome (32451415423).

The spelling of 21210214211 in words is "twenty-one billion, two hundred ten million, two hundred fourteen thousand, two hundred eleven".