82204378021 has 4 divisors (see below), whose sum is σ = 82205088844. Its totient is φ = 82203667200.

The previous prime is 82204377973. The next prime is 82204378097. The reversal of 82204378021 is 12087340228.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26598021921 + 55606356100 = 163089^2 + 235810^2 .

It is a cyclic number.

It is not a de Polignac number, because 82204378021 - 2¹³ = 82204369829 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 (82204375021) 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, 137340 + ... + 428101.

It is an arithmetic number, because the mean of its divisors is an integer number (20551272211).

Almost surely, 2^82204378021 is an apocalyptic number.

It is an amenable number.

82204378021 is a deficient number, since it is larger than the sum of its proper divisors (710823).

82204378021 is a wasteful number, since it uses less digits than its factorization.

82204378021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710822.

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 82204378021 in words is "eighty-two billion, two hundred four million, three hundred seventy-eight thousand, twenty-one".