12421023440 has 40 divisors (see below), whose sum is σ = 33004435200. Its totient is φ = 4258636416.

The previous prime is 12421023421. The next prime is 12421023451. The reversal of 12421023440 is 4432012421.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11089640 + ... + 11090759.

It is an arithmetic number, because the mean of its divisors is an integer number (825110880).

Almost surely, 2^12421023440 is an apocalyptic number.

12421023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12421023440 is an abundant number, since it is smaller than the sum of its proper divisors (20583411760).

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

12421023440 is a wasteful number, since it uses less digits than its factorization.

12421023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22180419 (or 22180413 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 12421023440 its reverse (4432012421), we get a palindrome (16853035861).

The spelling of 12421023440 in words is "twelve billion, four hundred twenty-one million, twenty-three thousand, four hundred forty".