211111320121 has 12 divisors (see below), whose sum is σ = 228613086720. Its totient is φ = 194860688880.

The previous prime is 211111320107. The next prime is 211111320139. The reversal of 211111320121 is 121023111112.

It is a happy number.

211111320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211111320121 - 2¹¹ = 211111318073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211111320095 and 211111320104.

It is not an unprimeable number, because it can be changed into a prime (211111321121) 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 in 11 ways as a sum of consecutive naturals, for example, 4763856 + ... + 4807966.

It is an arithmetic number, because the mean of its divisors is an integer number (19051090560).

Almost surely, 2^211111320121 is an apocalyptic number.

It is an amenable number.

211111320121 is a deficient number, since it is larger than the sum of its proper divisors (17501766599).

211111320121 is a wasteful number, since it uses less digits than its factorization.

211111320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72456 (or 72443 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 211111320121 its reverse (121023111112), we get a palindrome (332134431233).

The spelling of 211111320121 in words is "two hundred eleven billion, one hundred eleven million, three hundred twenty thousand, one hundred twenty-one".