210121112120 has 32 divisors (see below), whose sum is σ = 482831496000. Its totient is φ = 82260179328.

The previous prime is 210121112099. The next prime is 210121112129. The reversal of 210121112120 is 21211121012.

It is a super-2 number, since 2×210121112120² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210121112095 and 210121112104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121112129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55881395 + ... + 55885154.

It is an arithmetic number, because the mean of its divisors is an integer number (15088484250).

Almost surely, 2^210121112120 is an apocalyptic number.

210121112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121112120 is an abundant number, since it is smaller than the sum of its proper divisors (272710383880).

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

210121112120 is a wasteful number, since it uses less digits than its factorization.

210121112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111766607 (or 111766603 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210121112120 its reverse (21211121012), we get a palindrome (231332233132).

The spelling of 210121112120 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty".