21442421140 has 192 divisors, whose sum is σ = 54641664000. Its totient is φ = 6909940224.

The previous prime is 21442421089. The next prime is 21442421171. The reversal of 21442421140 is 4112424412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69844867 + ... + 69845173.

It is an arithmetic number, because the mean of its divisors is an integer number (284592000).

Almost surely, 2^21442421140 is an apocalyptic number.

21442421140 is a gapful number since it is divisible by the number (20) 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 21442421140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27320832000).

21442421140 is an abundant number, since it is smaller than the sum of its proper divisors (33199242860).

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

21442421140 is a wasteful number, since it uses less digits than its factorization.

21442421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21442421140 its reverse (4112424412), we get a palindrome (25554845552).

The spelling of 21442421140 in words is "twenty-one billion, four hundred forty-two million, four hundred twenty-one thousand, one hundred forty".