12421332520 has 64 divisors (see below), whose sum is σ = 28453997520. Its totient is φ = 4879171584.

The previous prime is 12421332509. The next prime is 12421332527. The reversal of 12421332520 is 2523312421.

It can be written as a sum of positive squares in 8 ways, for example, as 2737591684 + 9683740836 = 52322^2 + 98406^2 .

It is not an unprimeable number, because it can be changed into a prime (12421332527) 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, 671232 + ... + 689488.

Almost surely, 2^12421332520 is an apocalyptic number.

12421332520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12421332520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14226998760).

12421332520 is an abundant number, since it is smaller than the sum of its proper divisors (16032665000).

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

12421332520 is a wasteful number, since it uses less digits than its factorization.

12421332520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18574 (or 18570 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 12421332520 its reverse (2523312421), we get a palindrome (14944644941).

The spelling of 12421332520 in words is "twelve billion, four hundred twenty-one million, three hundred thirty-two thousand, five hundred twenty".