12315222520 has 32 divisors (see below), whose sum is σ = 27730731600. Its totient is φ = 4922270208.

The previous prime is 12315222431. The next prime is 12315222523. The reversal of 12315222520 is 2522251321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315222523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66810 + ... + 170569.

Almost surely, 2^12315222520 is an apocalyptic number.

12315222520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12315222520 is an abundant number, since it is smaller than the sum of its proper divisors (15415509080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12315222520 is a wasteful number, since it uses less digits than its factorization.

12315222520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238687 (or 238683 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 12315222520 its reverse (2522251321), we get a palindrome (14837473841).

The spelling of 12315222520 in words is "twelve billion, three hundred fifteen million, two hundred twenty-two thousand, five hundred twenty".