210128831 has 16 divisors (see below), whose sum is σ = 237904128. Its totient is φ = 183926400.

The previous prime is 210128801. The next prime is 210128833. The reversal of 210128831 is 138821012.

It is a cyclic number.

It is not a de Polignac number, because 210128831 - 2⁶ = 210128767 is a prime.

It is a super-2 number, since 2×210128831² = 88308251234853122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210128831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210128833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30455 + ... + 36711.

It is an arithmetic number, because the mean of its divisors is an integer number (14869008).

Almost surely, 2^210128831 is an apocalyptic number.

210128831 is a deficient number, since it is larger than the sum of its proper divisors (27775297).

210128831 is a wasteful number, since it uses less digits than its factorization.

210128831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6382.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 210128831 is about 14495.8211564575. The cubic root of 210128831 is about 594.5137198587.

Adding to 210128831 its reverse (138821012), we get a palindrome (348949843).

The spelling of 210128831 in words is "two hundred ten million, one hundred twenty-eight thousand, eight hundred thirty-one".