12784510321 has 4 divisors (see below), whose sum is σ = 13946738544. Its totient is φ = 11622282100.

The previous prime is 12784510309. The next prime is 12784510339. The reversal of 12784510321 is 12301548721.

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 not a de Polignac number, because 12784510321 - 2¹⁷ = 12784379249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12784510021) 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, 581114095 + ... + 581114116.

It is an arithmetic number, because the mean of its divisors is an integer number (3486684636).

Almost surely, 2^12784510321 is an apocalyptic number.

12784510321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12784510321 is a deficient number, since it is larger than the sum of its proper divisors (1162228223).

12784510321 is a wasteful number, since it uses less digits than its factorization.

12784510321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162228222.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 12784510321 in words is "twelve billion, seven hundred eighty-four million, five hundred ten thousand, three hundred twenty-one".