210121112111200 has 144 divisors (see below), whose sum is σ = 520154332992000. Its totient is φ = 82872229040640.

The previous prime is 210121112111167. The next prime is 210121112111203. The reversal of 210121112111200 is 2111211121012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121112111203) 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 23 ways as a sum of consecutive naturals, for example, 44455341 + ... + 48954259.

It is an arithmetic number, because the mean of its divisors is an integer number (3612182868000).

Almost surely, 2^{210121112111200} is an apocalyptic number.

210121112111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210121112111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260077166496000).

210121112111200 is an abundant number, since it is smaller than the sum of its proper divisors (310033220880800).

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

210121112111200 is a wasteful number, since it uses less digits than its factorization.

210121112111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499757 (or 4499744 counting only the distinct ones).

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

Adding to 210121112111200 its reverse (2111211121012), we get a palindrome (212232323232212).

The spelling of 210121112111200 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred".