12578348221 has 8 divisors (see below), whose sum is σ = 13017977784. Its totient is φ = 12145044480.

The previous prime is 12578348219. The next prime is 12578348243. The reversal of 12578348221 is 12284387521.

It can be written as a sum of positive squares in 4 ways, for example, as 857904100 + 11720444121 = 29290^2 + 108261^2 .

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 12578348221 - 2¹ = 12578348219 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 (12578448221) 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, 1577410 + ... + 1585363.

It is an arithmetic number, because the mean of its divisors is an integer number (1627247223).

Almost surely, 2^12578348221 is an apocalyptic number.

It is an amenable number.

12578348221 is a deficient number, since it is larger than the sum of its proper divisors (439629563).

12578348221 is an equidigital number, since it uses as much as digits as its factorization.

12578348221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162911.

The product of its digits is 215040, while the sum is 43.

The spelling of 12578348221 in words is "twelve billion, five hundred seventy-eight million, three hundred forty-eight thousand, two hundred twenty-one".