12540222321 has 24 divisors (see below), whose sum is σ = 18826786272. Its totient is φ = 7414756800.

The previous prime is 12540222313. The next prime is 12540222323. The reversal of 12540222321 is 12322204521.

It is not a de Polignac number, because 12540222321 - 2³ = 12540222313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12540222291 and 12540222300.

It is not an unprimeable number, because it can be changed into a prime (12540222323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406411 + ... + 436176.

It is an arithmetic number, because the mean of its divisors is an integer number (784449428).

Almost surely, 2^12540222321 is an apocalyptic number.

12540222321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12540222321 is a deficient number, since it is larger than the sum of its proper divisors (6286563951).

12540222321 is a wasteful number, since it uses less digits than its factorization.

12540222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842653 (or 842642 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 12540222321 its reverse (12322204521), we get a palindrome (24862426842).

The spelling of 12540222321 in words is "twelve billion, five hundred forty million, two hundred twenty-two thousand, three hundred twenty-one".