424240221440 has 144 divisors (see below), whose sum is σ = 1183271338368. Its totient is φ = 142709219328.

The previous prime is 424240221439. The next prime is 424240221443. The reversal of 424240221440 is 44122042424.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424240221443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28199 + ... + 921561.

It is an arithmetic number, because the mean of its divisors is an integer number (8217162072).

Almost surely, 2^424240221440 is an apocalyptic number.

424240221440 is a gapful number since it is divisible by the number (40) 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 424240221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (591635669184).

424240221440 is an abundant number, since it is smaller than the sum of its proper divisors (759031116928).

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

424240221440 is an equidigital number, since it uses as much as digits as its factorization.

424240221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893444 (or 893430 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 424240221440 its reverse (44122042424), we get a palindrome (468362263864).

The spelling of 424240221440 in words is "four hundred twenty-four billion, two hundred forty million, two hundred twenty-one thousand, four hundred forty".