210111112120 has 128 divisors (see below), whose sum is σ = 593721072000. Its totient is φ = 66496647168.

The previous prime is 210111112117. The next prime is 210111112129. The reversal of 210111112120 is 21211111012.

It is a happy number.

210111112120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 210111112120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111112129) 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 31 ways as a sum of consecutive naturals, for example, 410649 + ... + 767368.

It is an arithmetic number, because the mean of its divisors is an integer number (4638445875).

Almost surely, 2^210111112120 is an apocalyptic number.

210111112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210111112120 is an abundant number, since it is smaller than the sum of its proper divisors (383609959880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210111112120 is a wasteful number, since it uses less digits than its factorization.

210111112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178062 (or 1178044 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210111112120 its reverse (21211111012), we get a palindrome (231322223132).

The spelling of 210111112120 in words is "two hundred ten billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty".