12420210440 has 64 divisors (see below), whose sum is σ = 30499744320. Its totient is φ = 4514400000.

The previous prime is 12420210379. The next prime is 12420210449. The reversal of 12420210440 is 4401202421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (12420210449) 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, 1249490 + ... + 1259390.

It is an arithmetic number, because the mean of its divisors is an integer number (476558505).

Almost surely, 2^12420210440 is an apocalyptic number.

12420210440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12420210440 is an abundant number, since it is smaller than the sum of its proper divisors (18079533880).

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

12420210440 is a wasteful number, since it uses less digits than its factorization.

12420210440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12774 (or 12770 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 12420210440 its reverse (4401202421), we get a palindrome (16821412861).

The spelling of 12420210440 in words is "twelve billion, four hundred twenty million, two hundred ten thousand, four hundred forty".