12506000221 has 16 divisors (see below), whose sum is σ = 14701776768. Its totient is φ = 10487822400.

The previous prime is 12506000209. The next prime is 12506000237. The reversal of 12506000221 is 12200060521.

It is the 45655-th star number.

It is not a de Polignac number, because 12506000221 - 2⁷ = 12506000093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12506006221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202591 + ... + 257011.

It is an arithmetic number, because the mean of its divisors is an integer number (918861048).

Almost surely, 2^12506000221 is an apocalyptic number.

12506000221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12506000221 is a deficient number, since it is larger than the sum of its proper divisors (2195776547).

12506000221 is a wasteful number, since it uses less digits than its factorization.

12506000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56052.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 12506000221 its reverse (12200060521), we get a palindrome (24706060742).

The spelling of 12506000221 in words is "twelve billion, five hundred six million, two hundred twenty-one", and thus it is an aban number.