211122212011111 has 4 divisors (see below), whose sum is σ = 211122242073000. Its totient is φ = 211122181949224.

The previous prime is 211122212011043. The next prime is 211122212011177. The reversal of 211122212011111 is 111110212221112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 211122212011111 - 2²⁷ = 211122077793383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122212011181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1743480 + ... + 20622418.

It is an arithmetic number, because the mean of its divisors is an integer number (52780560518250).

Almost surely, 2^{211122212011111} is an apocalyptic number.

211122212011111 is a deficient number, since it is larger than the sum of its proper divisors (30061889).

211122212011111 is a wasteful number, since it uses less digits than its factorization.

211122212011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30061888.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211122212011111 its reverse (111110212221112), we get a palindrome (322232424232223).

The spelling of 211122212011111 in words is "two hundred eleven trillion, one hundred twenty-two billion, two hundred twelve million, eleven thousand, one hundred eleven".