82021396 has 24 divisors (see below), whose sum is σ = 157225320. Its totient is φ = 37266432.

The previous prime is 82021351. The next prime is 82021399. The reversal of 82021396 is 69312028.

It can be written as a sum of positive squares in 4 ways, for example, as 11696400 + 70324996 = 3420^2 + 8386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82021399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18825 + ... + 22768.

It is an arithmetic number, because the mean of its divisors is an integer number (6551055).

Almost surely, 2^82021396 is an apocalyptic number.

It is an amenable number.

82021396 is a deficient number, since it is larger than the sum of its proper divisors (75203924).

82021396 is a wasteful number, since it uses less digits than its factorization.

82021396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41643 (or 41641 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 82021396 is about 9056.5664575489. The cubic root of 82021396 is about 434.4859316835.

The spelling of 82021396 in words is "eighty-two million, twenty-one thousand, three hundred ninety-six".