82221019 has 4 divisors (see below), whose sum is σ = 82565280. Its totient is φ = 81876760.

The previous prime is 82221017. The next prime is 82221101. The reversal of 82221019 is 91012228.

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

It is a cyclic number.

It is not a de Polignac number, because 82221019 - 2¹ = 82221017 is a prime.

It is a super-2 number, since 2×82221019² = 13520591930796722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82220984 and 82221002.

It is not an unprimeable number, because it can be changed into a prime (82221011) 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, 171772 + ... + 172249.

It is an arithmetic number, because the mean of its divisors is an integer number (20641320).

Almost surely, 2^82221019 is an apocalyptic number.

82221019 is a deficient number, since it is larger than the sum of its proper divisors (344261).

82221019 is a wasteful number, since it uses less digits than its factorization.

82221019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344260.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 82221019 is about 9067.5806585880. The cubic root of 82221019 is about 434.8381288771.

The spelling of 82221019 in words is "eighty-two million, two hundred twenty-one thousand, nineteen".