21211202220211 has 2 divisors, whose sum is σ = 21211202220212. Its totient is φ = 21211202220210.

The previous prime is 21211202220181. The next prime is 21211202220251. The reversal of 21211202220211 is 11202220211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211202220211 - 2⁵ = 21211202220179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211202220251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605601110105 + 10605601110106.

It is an arithmetic number, because the mean of its divisors is an integer number (10605601110106).

Almost surely, 2^{21211202220211} is an apocalyptic number.

21211202220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211202220211 is an equidigital number, since it uses as much as digits as its factorization.

21211202220211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211202220211 its reverse (11202220211212), we get a palindrome (32413422431423).

The spelling of 21211202220211 in words is "twenty-one trillion, two hundred eleven billion, two hundred two million, two hundred twenty thousand, two hundred eleven".