211222121211 has 6 divisors (see below), whose sum is σ = 305098619540. Its totient is φ = 140814747468.

The previous prime is 211222121189. The next prime is 211222121219. The reversal of 211222121211 is 112121222112.

211222121211 is a `hidden beast` number, since 211 + 2 + 221 + 21 + 211 = 666.

It is not a de Polignac number, because 211222121211 - 2⁷ = 211222121083 is a prime.

It is a super-2 number, since 2×211222121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211222121219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734562281 + ... + 11734562298.

Almost surely, 2^211222121211 is an apocalyptic number.

211222121211 is a deficient number, since it is larger than the sum of its proper divisors (93876498329).

211222121211 is a wasteful number, since it uses less digits than its factorization.

211222121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23469124585 (or 23469124582 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 211222121211 its reverse (112121222112), we get a palindrome (323343343323).

The spelling of 211222121211 in words is "two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".