21443422240 has 48 divisors (see below), whose sum is σ = 50753931480. Its totient is φ = 8561479680.

The previous prime is 21443422229. The next prime is 21443422283. The reversal of 21443422240 is 4222434412.

It can be written as a sum of positive squares in 4 ways, for example, as 20354158224 + 1089264016 = 142668^2 + 33004^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21443422199 and 21443422208.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 37305 + ... + 210424.

Almost surely, 2^21443422240 is an apocalyptic number.

21443422240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443422240 is an abundant number, since it is smaller than the sum of its proper divisors (29310509240).

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

21443422240 is a wasteful number, since it uses less digits than its factorization.

21443422240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248285 (or 248277 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21443422240 its reverse (4222434412), we get a palindrome (25665856652).

The spelling of 21443422240 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty-two thousand, two hundred forty".