21211102120211 has 2 divisors, whose sum is σ = 21211102120212. Its totient is φ = 21211102120210.

The previous prime is 21211102120189. The next prime is 21211102120231. The reversal of 21211102120211 is 11202120111212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211102120211 - 2²⁶ = 21211035011347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211102120211.

It is not a weakly prime, because it can be changed into another prime (21211102120231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605551060105 + 10605551060106.

It is an arithmetic number, because the mean of its divisors is an integer number (10605551060106).

Almost surely, 2^{21211102120211} is an apocalyptic number.

21211102120211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211102120211 is an equidigital number, since it uses as much as digits as its factorization.

21211102120211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211102120211 its reverse (11202120111212), we get a palindrome (32413222231423).

The spelling of 21211102120211 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred twenty thousand, two hundred eleven".