12420440142 has 64 divisors (see below), whose sum is σ = 28757182464. Its totient is φ = 3534474240.

The previous prime is 12420440099. The next prime is 12420440147. The reversal of 12420440142 is 24104402421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420440147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500643 + ... + 524865.

It is an arithmetic number, because the mean of its divisors is an integer number (449330976).

Almost surely, 2^12420440142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12420440142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14378591232).

12420440142 is an abundant number, since it is smaller than the sum of its proper divisors (16336742322).

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

12420440142 is a wasteful number, since it uses less digits than its factorization.

12420440142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24713.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 12420440142 its reverse (24104402421), we get a palindrome (36524842563).

The spelling of 12420440142 in words is "twelve billion, four hundred twenty million, four hundred forty thousand, one hundred forty-two".