82144321 has 4 divisors (see below), whose sum is σ = 93879232. Its totient is φ = 70409412.

The previous prime is 82144313. The next prime is 82144367. The reversal of 82144321 is 12344128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82144321 - 2³ = 82144313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82144421) 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, 5867445 + ... + 5867458.

It is an arithmetic number, because the mean of its divisors is an integer number (23469808).

Almost surely, 2^82144321 is an apocalyptic number.

It is an amenable number.

82144321 is a deficient number, since it is larger than the sum of its proper divisors (11734911).

82144321 is a wasteful number, since it uses less digits than its factorization.

82144321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11734910.

The product of its digits is 1536, while the sum is 25.

The square root of 82144321 is about 9063.3504290632. The cubic root of 82144321 is about 434.7028772066.

Adding to 82144321 its reverse (12344128), we get a palindrome (94488449).

The spelling of 82144321 in words is "eighty-two million, one hundred forty-four thousand, three hundred twenty-one".