82299821 has 4 divisors (see below), whose sum is σ = 83028252. Its totient is φ = 81571392.

The previous prime is 82299793. The next prime is 82299827. The reversal of 82299821 is 12899228.

Added to its reverse (12899228) it gives a square (95199049 = 9757²).

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29214025 + 53085796 = 5405^2 + 7286^2 .

It is a cyclic number.

It is not a de Polignac number, because 82299821 - 2⁶ = 82299757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82299827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364046 + ... + 364271.

It is an arithmetic number, because the mean of its divisors is an integer number (20757063).

Almost surely, 2^82299821 is an apocalyptic number.

It is an amenable number.

82299821 is a deficient number, since it is larger than the sum of its proper divisors (728431).

82299821 is a wasteful number, since it uses less digits than its factorization.

82299821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728430.

The product of its digits is 41472, while the sum is 41.

The square root of 82299821 is about 9071.9248784368. The cubic root of 82299821 is about 434.9770032322.

Adding to 82299821 its reverse (12899228), we get a square (95199049 = 9757²).

The spelling of 82299821 in words is "eighty-two million, two hundred ninety-nine thousand, eight hundred twenty-one".