211220211911 has 2 divisors, whose sum is σ = 211220211912. Its totient is φ = 211220211910.

The previous prime is 211220211887. The next prime is 211220211919. The reversal of 211220211911 is 119112022112.

It is a happy number.

211220211911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211220211911 - 2⁶ = 211220211847 is a prime.

It is a super-2 number, since 2×211220211911² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220211919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610105955 + 105610105956.

It is an arithmetic number, because the mean of its divisors is an integer number (105610105956).

Almost surely, 2^211220211911 is an apocalyptic number.

211220211911 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220211911 is an equidigital number, since it uses as much as digits as its factorization.

211220211911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211220211911 in words is "two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, nine hundred eleven".