81334212 has 48 divisors (see below), whose sum is σ = 206673600. Its totient is φ = 24796800.

The previous prime is 81334207. The next prime is 81334219. The reversal of 81334212 is 21243318.

It is not an unprimeable number, because it can be changed into a prime (81334219) 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 15 ways as a sum of consecutive naturals, for example, 462 + ... + 12762.

It is an arithmetic number, because the mean of its divisors is an integer number (4305700).

Almost surely, 2^81334212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81334212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103336800).

81334212 is an abundant number, since it is smaller than the sum of its proper divisors (125339388).

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

81334212 is a wasteful number, since it uses less digits than its factorization.

81334212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12356 (or 12354 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 81334212 is about 9018.5482201960. The cubic root of 81334212 is about 433.2691373672.

The spelling of 81334212 in words is "eighty-one million, three hundred thirty-four thousand, two hundred twelve".