12421755840 has 224 divisors, whose sum is σ = 44972020800. Its totient is φ = 2877751296.

The previous prime is 12421755791. The next prime is 12421755851. The reversal of 12421755840 is 4855712421.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182886 + ... + 241434.

It is an arithmetic number, because the mean of its divisors is an integer number (200767950).

Almost surely, 2^12421755840 is an apocalyptic number.

12421755840 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 12421755840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22486010400).

12421755840 is an abundant number, since it is smaller than the sum of its proper divisors (32550264960).

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

12421755840 is a wasteful number, since it uses less digits than its factorization.

12421755840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58599 (or 58589 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 12421755840 in words is "twelve billion, four hundred twenty-one million, seven hundred fifty-five thousand, eight hundred forty".