210231 has 24 divisors (see below), whose sum is σ = 359424. Its totient is φ = 115920.

The previous prime is 210229. The next prime is 210233. The reversal of 210231 is 132012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (210229) and next prime (210233).

It is not a de Polignac number, because 210231 - 2¹ = 210229 is a prime.

It is a super-2 number, since 2×210231² = 88394146722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

210231 is a modest number, since divided by 231 gives 21 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210233) 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 23 ways as a sum of consecutive naturals, for example, 2926 + ... + 2996.

It is an arithmetic number, because the mean of its divisors is an integer number (14976).

2²¹⁰²³¹ is an apocalyptic number.

210231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

210231 is a deficient number, since it is larger than the sum of its proper divisors (149193).

210231 is a wasteful number, since it uses less digits than its factorization.

210231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 210231 is about 458.5095418854. The cubic root of 210231 is about 59.4610059217.

Adding to 210231 its reverse (132012), we get a palindrome (342243).

It can be divided in two parts, 210 and 231, that added together give a square (441 = 21²).

The spelling of 210231 in words is "two hundred ten thousand, two hundred thirty-one".