12421553540 has 48 divisors (see below), whose sum is σ = 30130579584. Its totient is φ = 4251225600.

The previous prime is 12421553537. The next prime is 12421553549. The reversal of 12421553540 is 4535512421.

It is a junction number, because it is equal to n+sod(n) for n = 12421553497 and 12421553506.

It is not an unprimeable number, because it can be changed into a prime (12421553549) 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, 1656896 + ... + 1664375.

It is an arithmetic number, because the mean of its divisors is an integer number (627720408).

Almost surely, 2^12421553540 is an apocalyptic number.

12421553540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12421553540 is an abundant number, since it is smaller than the sum of its proper divisors (17709026044).

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

12421553540 is a wasteful number, since it uses less digits than its factorization.

12421553540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321308 (or 3321306 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 12421553540 in words is "twelve billion, four hundred twenty-one million, five hundred fifty-three thousand, five hundred forty".