82106521 has 8 divisors (see below), whose sum is σ = 93891200. Its totient is φ = 70335648.

The previous prime is 82106513. The next prime is 82106533. The reversal of 82106521 is 12560128.

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 82106521 - 2³ = 82106513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82106501) 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 7 ways as a sum of consecutive naturals, for example, 19420 + ... + 23266.

It is an arithmetic number, because the mean of its divisors is an integer number (11736400).

Almost surely, 2^82106521 is an apocalyptic number.

It is an amenable number.

82106521 is a deficient number, since it is larger than the sum of its proper divisors (11784679).

82106521 is a wasteful number, since it uses less digits than its factorization.

82106521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6903.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 82106521 is about 9061.2648675557. The cubic root of 82106521 is about 434.6361885232.

Adding to 82106521 its reverse (12560128), we get a palindrome (94666649).

The spelling of 82106521 in words is "eighty-two million, one hundred six thousand, five hundred twenty-one".