211121121201111 has 48 divisors (see below), whose sum is σ = 347286286893312. Its totient is φ = 122337433468800.

The previous prime is 211121121201071. The next prime is 211121121201121. The reversal of 211121121201111 is 111102121121112.

211121121201111 is a `hidden beast` number, since 211 + 1 + 21 + 121 + 201 + 111 = 666.

It is not a de Polignac number, because 211121121201111 - 2²¹ = 211121119103959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121121201121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14153950 + ... + 24951483.

It is an arithmetic number, because the mean of its divisors is an integer number (7235130976944).

Almost surely, 2^{211121121201111} is an apocalyptic number.

211121121201111 is a deficient number, since it is larger than the sum of its proper divisors (136165165692201).

211121121201111 is a wasteful number, since it uses less digits than its factorization.

211121121201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39107844 (or 39107841 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 211121121201111 its reverse (111102121121112), we get a palindrome (322223242322223).

The spelling of 211121121201111 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".