21220020211211 has 2 divisors, whose sum is σ = 21220020211212. Its totient is φ = 21220020211210.

The previous prime is 21220020211199. The next prime is 21220020211219. The reversal of 21220020211211 is 11211202002212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220020211211 - 2¹⁰ = 21220020210187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220020211211.

It is not a weakly prime, because it can be changed into another prime (21220020211219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610010105605 + 10610010105606.

It is an arithmetic number, because the mean of its divisors is an integer number (10610010105606).

Almost surely, 2^{21220020211211} is an apocalyptic number.

21220020211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220020211211 is an equidigital number, since it uses as much as digits as its factorization.

21220020211211 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 21220020211211 its reverse (11211202002212), we get a palindrome (32431222213423).

The spelling of 21220020211211 in words is "twenty-one trillion, two hundred twenty billion, twenty million, two hundred eleven thousand, two hundred eleven".