12534793421 has 4 divisors (see below), whose sum is σ = 12598422012. Its totient is φ = 12471164832.

The previous prime is 12534793417. The next prime is 12534793433. The reversal of 12534793421 is 12439743521.

12534793421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12439743521 = 4007 ⋅3104503.

It can be written as a sum of positive squares in 2 ways, for example, as 12324108196 + 210685225 = 111014^2 + 14515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12534793421 - 2² = 12534793417 is a prime.

It is a super-2 number, since 2×12534793421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12534793471) 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 3 ways as a sum of consecutive naturals, for example, 31814000 + ... + 31814393.

It is an arithmetic number, because the mean of its divisors is an integer number (3149605503).

Almost surely, 2^12534793421 is an apocalyptic number.

It is an amenable number.

12534793421 is a deficient number, since it is larger than the sum of its proper divisors (63628591).

12534793421 is an equidigital number, since it uses as much as digits as its factorization.

12534793421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63628590.

The product of its digits is 181440, while the sum is 41.

The spelling of 12534793421 in words is "twelve billion, five hundred thirty-four million, seven hundred ninety-three thousand, four hundred twenty-one".