18271282321 has 8 divisors (see below), whose sum is σ = 19347305544. Its totient is φ = 17195397120.

The previous prime is 18271282297. The next prime is 18271282327. The reversal of 18271282321 is 12328217281.

It can be written as a sum of positive squares in 4 ways, for example, as 10870981696 + 7400300625 = 104264^2 + 86025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18271282321 - 2⁷ = 18271282193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18271282327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381321 + ... + 426553.

It is an arithmetic number, because the mean of its divisors is an integer number (2418413193).

Almost surely, 2^18271282321 is an apocalyptic number.

It is an amenable number.

18271282321 is a deficient number, since it is larger than the sum of its proper divisors (1076023223).

18271282321 is a wasteful number, since it uses less digits than its factorization.

18271282321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69011.

The product of its digits is 21504, while the sum is 37.

The spelling of 18271282321 in words is "eighteen billion, two hundred seventy-one million, two hundred eighty-two thousand, three hundred twenty-one".