4021243421340 has 96 divisors (see below), whose sum is σ = 11428467240960. Its totient is φ = 1056300710400.

The previous prime is 4021243421323. The next prime is 4021243421341. The reversal of 4021243421340 is 431243421204.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 4021243421298 and 4021243421307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021243421341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058760 + ... + 3027120.

It is an arithmetic number, because the mean of its divisors is an integer number (119046533760).

Almost surely, 2^{4021243421340} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021243421340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5714233620480).

4021243421340 is an abundant number, since it is smaller than the sum of its proper divisors (7407223819620).

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

4021243421340 is a wasteful number, since it uses less digits than its factorization.

4021243421340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968883 (or 1968881 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 4021243421340 its reverse (431243421204), we get a palindrome (4452486842544).

The spelling of 4021243421340 in words is "four trillion, twenty-one billion, two hundred forty-three million, four hundred twenty-one thousand, three hundred forty".