211222021211 has 4 divisors (see below), whose sum is σ = 211229885424. Its totient is φ = 211214157000.

The previous prime is 211222021187. The next prime is 211222021279. The reversal of 211222021211 is 112120222112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211222021211 - 2⁶ = 211222021147 is a prime.

It is a super-2 number, since 2×211222021211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211222021211.

It is not an unprimeable number, because it can be changed into a prime (211222021511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3891680 + ... + 3945581.

It is an arithmetic number, because the mean of its divisors is an integer number (52807471356).

Almost surely, 2^211222021211 is an apocalyptic number.

211222021211 is a deficient number, since it is larger than the sum of its proper divisors (7864213).

211222021211 is an equidigital number, since it uses as much as digits as its factorization.

211222021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7864212.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211222021211 its reverse (112120222112), we get a palindrome (323342243323).

The spelling of 211222021211 in words is "two hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred eleven".