21422243040 has 192 divisors, whose sum is σ = 74443380480. Its totient is φ = 5134807040.

The previous prime is 21422243039. The next prime is 21422243047. The reversal of 21422243040 is 4034222412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21422243040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422243047) 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, 447127 + ... + 492713.

It is an arithmetic number, because the mean of its divisors is an integer number (387725940).

Almost surely, 2^21422243040 is an apocalyptic number.

21422243040 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 21422243040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37221690240).

21422243040 is an abundant number, since it is smaller than the sum of its proper divisors (53021137440).

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

21422243040 is a wasteful number, since it uses less digits than its factorization.

21422243040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45705 (or 45697 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21422243040 its reverse (4034222412), we get a palindrome (25456465452).

It can be divided in two parts, 21422 and 243040, that added together give a palindrome (264462).

The spelling of 21422243040 in words is "twenty-one billion, four hundred twenty-two million, two hundred forty-three thousand, forty".