210081 has 8 divisors (see below), whose sum is σ = 282240. Its totient is φ = 138992.

The previous prime is 210071. The next prime is 210097. The reversal of 210081 is 180012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210081 - 2⁷ = 209953 is a prime.

It is a super-2 number, since 2×210081² = 88268053122, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571 + ... + 863.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2²¹⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

210081 is a deficient number, since it is larger than the sum of its proper divisors (72159).

210081 is a wasteful number, since it uses less digits than its factorization.

210081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 210081 is about 458.3459392206. The cubic root of 210081 is about 59.4468607306.

Adding to 210081 its reverse (180012), we get a palindrome (390093).

The spelling of 210081 in words is "two hundred ten thousand, eighty-one".