12340321521 has 16 divisors (see below), whose sum is σ = 17951701440. Its totient is φ = 7478089920.

The previous prime is 12340321519. The next prime is 12340321523. The reversal of 12340321521 is 12512304321.

It is an interprime number because it is at equal distance from previous prime (12340321519) and next prime (12340321523).

It is not a de Polignac number, because 12340321521 - 2¹ = 12340321519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12340321491 and 12340321500.

It is not an unprimeable number, because it can be changed into a prime (12340321523) 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, 351975 + ... + 385443.

It is an arithmetic number, because the mean of its divisors is an integer number (1121981340).

Almost surely, 2^12340321521 is an apocalyptic number.

12340321521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12340321521 is a deficient number, since it is larger than the sum of its proper divisors (5611379919).

12340321521 is a wasteful number, since it uses less digits than its factorization.

12340321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44656.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 12340321521 its reverse (12512304321), we get a palindrome (24852625842).

The spelling of 12340321521 in words is "twelve billion, three hundred forty million, three hundred twenty-one thousand, five hundred twenty-one".