210130720 has 24 divisors (see below), whose sum is σ = 496434204. Its totient is φ = 84052224.

The previous prime is 210130673. The next prime is 210130721. The reversal of 210130720 is 27031012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 189227536 + 20903184 = 13756^2 + 4572^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 210130694 and 210130703.

It is not an unprimeable number, because it can be changed into a prime (210130721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 656499 + ... + 656818.

Almost surely, 2^210130720 is an apocalyptic number.

210130720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210130720 is an abundant number, since it is smaller than the sum of its proper divisors (286303484).

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

210130720 is a wasteful number, since it uses less digits than its factorization.

210130720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313332 (or 1313324 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 210130720 is about 14495.8863130200. The cubic root of 210130720 is about 594.5155013579.

Adding to 210130720 its reverse (27031012), we get a palindrome (237161732).

The spelling of 210130720 in words is "two hundred ten million, one hundred thirty thousand, seven hundred twenty".