81210 has 16 divisors (see below), whose sum is σ = 194976. Its totient is φ = 21648.

The previous prime is 81203. The next prime is 81223. The reversal of 81210 is 1218.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

81210 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (12186).

2⁸¹²¹⁰ is an apocalyptic number.

81210 is an abundant number, since it is smaller than the sum of its proper divisors (113766).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97488).

81210 is a wasteful number, since it uses less digits than its factorization.

81210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717.

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

The square root of 81210 is about 284.9736829955. The cubic root of 81210 is about 43.3048464974.

Adding to 81210 its reverse (1218), we get a palindrome (82428).

The spelling of 81210 in words is "eighty-one thousand, two hundred ten".