12803783521 has 4 divisors (see below), whose sum is σ = 12804210352. Its totient is φ = 12803356692.

The previous prime is 12803783483. The next prime is 12803783537. The reversal of 12803783521 is 12538730821.

It is a happy number.

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 12803783521 - 2²⁵ = 12770229089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12803783561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164715 + ... + 229648.

It is an arithmetic number, because the mean of its divisors is an integer number (3201052588).

Almost surely, 2^12803783521 is an apocalyptic number.

It is an amenable number.

12803783521 is a deficient number, since it is larger than the sum of its proper divisors (426831).

12803783521 is an equidigital number, since it uses as much as digits as its factorization.

12803783521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426830.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 12803783521 in words is "twelve billion, eight hundred three million, seven hundred eighty-three thousand, five hundred twenty-one".