82221473 has 4 divisors (see below), whose sum is σ = 83569428. Its totient is φ = 80873520.

The previous prime is 82221457. The next prime is 82221499. The reversal of 82221473 is 37412228.

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 26450449 + 55771024 = 5143^2 + 7468^2 .

It is a cyclic number.

It is not a de Polignac number, because 82221473 - 2⁴ = 82221457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82221973) 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 3 ways as a sum of consecutive naturals, for example, 673886 + ... + 674007.

It is an arithmetic number, because the mean of its divisors is an integer number (20892357).

Almost surely, 2^82221473 is an apocalyptic number.

It is an amenable number.

82221473 is a deficient number, since it is larger than the sum of its proper divisors (1347955).

82221473 is a wasteful number, since it uses less digits than its factorization.

82221473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347954.

The product of its digits is 5376, while the sum is 29.

The square root of 82221473 is about 9067.6056927945. The cubic root of 82221473 is about 434.8389292245.

The spelling of 82221473 in words is "eighty-two million, two hundred twenty-one thousand, four hundred seventy-three".