12315521500 has 24 divisors (see below), whose sum is σ = 26897100048. Its totient is φ = 4926208400.

The previous prime is 12315521489. The next prime is 12315521503. The reversal of 12315521500 is 512551321.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315521503) 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, 12315022 + ... + 12316021.

It is an arithmetic number, because the mean of its divisors is an integer number (1120712502).

Almost surely, 2^12315521500 is an apocalyptic number.

12315521500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12315521500 is an abundant number, since it is smaller than the sum of its proper divisors (14581578548).

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

12315521500 is a wasteful number, since it uses less digits than its factorization.

12315521500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24631062 (or 24631050 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The spelling of 12315521500 in words is "twelve billion, three hundred fifteen million, five hundred twenty-one thousand, five hundred".