210121300 has 18 divisors (see below), whose sum is σ = 455963438. Its totient is φ = 84048480.

The previous prime is 210121297. The next prime is 210121321. The reversal of 210121300 is 3121012.

It can be written as a sum of positive squares in 3 ways, for example, as 16744464 + 193376836 = 4092^2 + 13906^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1050507 + ... + 1050706.

Almost surely, 2^210121300 is an apocalyptic number.

210121300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121300 is an abundant number, since it is smaller than the sum of its proper divisors (245842138).

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

210121300 is a wasteful number, since it uses less digits than its factorization.

210121300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101227 (or 2101220 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 210121300 is about 14495.5613896116. The cubic root of 210121300 is about 594.5066173329.

Adding to 210121300 its reverse (3121012), we get a palindrome (213242312).

The spelling of 210121300 in words is "two hundred ten million, one hundred twenty-one thousand, three hundred".