82734221 has 4 divisors (see below), whose sum is σ = 82753500. Its totient is φ = 82714944.

The previous prime is 82734209. The next prime is 82734233. The reversal of 82734221 is 12243728.

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

It is an interprime number because it is at equal distance from previous prime (82734209) and next prime (82734233).

It can be written as a sum of positive squares in 2 ways, for example, as 74149321 + 8584900 = 8611^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 82734221 - 2¹⁰ = 82733197 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 (82734521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 12863.

It is an arithmetic number, because the mean of its divisors is an integer number (20688375).

Almost surely, 2^82734221 is an apocalyptic number.

It is an amenable number.

82734221 is a deficient number, since it is larger than the sum of its proper divisors (19279).

82734221 is a wasteful number, since it uses less digits than its factorization.

82734221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19278.

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

The square root of 82734221 is about 9095.8353657045. The cubic root of 82734221 is about 435.7409681667.

Adding to 82734221 its reverse (12243728), we get a palindrome (94977949).

The spelling of 82734221 in words is "eighty-two million, seven hundred thirty-four thousand, two hundred twenty-one".