210121210120 has 32 divisors (see below), whose sum is σ = 472803088320. Its totient is φ = 84043085760.

The previous prime is 210121210037. The next prime is 210121210127. The reversal of 210121210120 is 21012121012.

It is a self number, because there is not a number n which added to its sum of digits gives 210121210120.

It is not an unprimeable number, because it can be changed into a prime (210121210127) 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, 494005 + ... + 815035.

It is an arithmetic number, because the mean of its divisors is an integer number (14775096510).

Almost surely, 2^210121210120 is an apocalyptic number.

210121210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121210120 is an abundant number, since it is smaller than the sum of its proper divisors (262681878200).

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

210121210120 is a wasteful number, since it uses less digits than its factorization.

210121210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337405 (or 337401 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210121210120 its reverse (21012121012), we get a palindrome (231133331132).

The spelling of 210121210120 in words is "two hundred ten billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty".