21443043040 has 48 divisors (see below), whose sum is σ = 50776891200. Its totient is φ = 8557288960.

The previous prime is 21443043019. The next prime is 21443043049. The reversal of 21443043040 is 4034034412.

It is a junction number, because it is equal to n+sod(n) for n = 21443042996 and 21443043014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443043049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86515 + ... + 224434.

It is an arithmetic number, because the mean of its divisors is an integer number (1057851900).

Almost surely, 2^21443043040 is an apocalyptic number.

21443043040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443043040 is an abundant number, since it is smaller than the sum of its proper divisors (29333848160).

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

21443043040 is a wasteful number, since it uses less digits than its factorization.

21443043040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311395 (or 311387 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21443043040 its reverse (4034034412), we get a palindrome (25477077452).

The spelling of 21443043040 in words is "twenty-one billion, four hundred forty-three million, forty-three thousand, forty".