12535144421 has 4 divisors (see below), whose sum is σ = 12664372812. Its totient is φ = 12405916032.

The previous prime is 12535144343. The next prime is 12535144477. The reversal of 12535144421 is 12444153521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12444153521 = 88729 ⋅140249.

It can be written as a sum of positive squares in 2 ways, for example, as 6004080196 + 6531064225 = 77486^2 + 80815^2 .

It is a cyclic number.

It is not a de Polignac number, because 12535144421 - 2²⁶ = 12468035557 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 (12535140421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64614050 + ... + 64614243.

It is an arithmetic number, because the mean of its divisors is an integer number (3166093203).

Almost surely, 2^12535144421 is an apocalyptic number.

It is an amenable number.

12535144421 is a deficient number, since it is larger than the sum of its proper divisors (129228391).

12535144421 is an equidigital number, since it uses as much as digits as its factorization.

12535144421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129228390.

The product of its digits is 19200, while the sum is 32.

Adding to 12535144421 its reverse (12444153521), we get a palindrome (24979297942).

The spelling of 12535144421 in words is "twelve billion, five hundred thirty-five million, one hundred forty-four thousand, four hundred twenty-one".