12503305021 has 8 divisors (see below), whose sum is σ = 13048921080. Its totient is φ = 11965320192.

The previous prime is 12503305013. The next prime is 12503305063. The reversal of 12503305021 is 12050330521.

12503305021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1407000100 + 11096304921 = 37510^2 + 105339^2 .

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

It is not a de Polignac number, because 12503305021 - 2³ = 12503305013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12503304983 and 12503305001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12503305081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1904460 + ... + 1911013.

It is an arithmetic number, because the mean of its divisors is an integer number (1631115135).

Almost surely, 2^12503305021 is an apocalyptic number.

It is an amenable number.

12503305021 is a deficient number, since it is larger than the sum of its proper divisors (545616059).

12503305021 is a wasteful number, since it uses less digits than its factorization.

12503305021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815615.

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 12503305021 its reverse (12050330521), we get a palindrome (24553635542).

The spelling of 12503305021 in words is "twelve billion, five hundred three million, three hundred five thousand, twenty-one".