12601353221 has 16 divisors (see below), whose sum is σ = 13017605808. Its totient is φ = 12192768000.

The previous prime is 12601353197. The next prime is 12601353307. The reversal of 12601353221 is 12235310621.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2437890625 + 10163462596 = 49375^2 + 100814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12601353221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12601353521) 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, 1782125 + ... + 1789181.

It is an arithmetic number, because the mean of its divisors is an integer number (813600363).

Almost surely, 2^12601353221 is an apocalyptic number.

It is an amenable number.

12601353221 is a deficient number, since it is larger than the sum of its proper divisors (416252587).

12601353221 is an equidigital number, since it uses as much as digits as its factorization.

12601353221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 12601353221 its reverse (12235310621), we get a palindrome (24836663842).

The spelling of 12601353221 in words is "twelve billion, six hundred one million, three hundred fifty-three thousand, two hundred twenty-one".