210243321 has 12 divisors (see below), whose sum is σ = 305724900. Its totient is φ = 139220640.

The previous prime is 210243289. The next prime is 210243323. The reversal of 210243321 is 123342012.

210243321 is a `hidden beast` number, since 210 + 2 + 433 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66243321 + 144000000 = 8139^2 + 12000^2 .

It is not a de Polignac number, because 210243321 - 2⁵ = 210243289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210243294 and 210243303.

It is not an unprimeable number, because it can be changed into a prime (210243323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77050 + ... + 79731.

It is an arithmetic number, because the mean of its divisors is an integer number (25477075).

Almost surely, 2^210243321 is an apocalyptic number.

It is an amenable number.

210243321 is a deficient number, since it is larger than the sum of its proper divisors (95481579).

210243321 is a wasteful number, since it uses less digits than its factorization.

210243321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156936 (or 156933 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 210243321 is about 14499.7696878261. The cubic root of 210243321 is about 594.6216750866.

Adding to 210243321 its reverse (123342012), we get a palindrome (333585333).

The spelling of 210243321 in words is "two hundred ten million, two hundred forty-three thousand, three hundred twenty-one".