21220211122211 has 2 divisors, whose sum is σ = 21220211122212. Its totient is φ = 21220211122210.

The previous prime is 21220211122153. The next prime is 21220211122223. The reversal of 21220211122211 is 11222111202212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220211122211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220211152211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610105561105 + 10610105561106.

It is an arithmetic number, because the mean of its divisors is an integer number (10610105561106).

Almost surely, 2^{21220211122211} is an apocalyptic number.

21220211122211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220211122211 is an equidigital number, since it uses as much as digits as its factorization.

21220211122211 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 20.

Adding to 21220211122211 its reverse (11222111202212), we get a palindrome (32442322324423).

The spelling of 21220211122211 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-two thousand, two hundred eleven".