21443042000 has 80 divisors (see below), whose sum is σ = 51905000784. Its totient is φ = 8568000000.

The previous prime is 21443041981. The next prime is 21443042003. The reversal of 21443042000 is 24034412.

It can be written as a sum of positive squares in 8 ways, for example, as 8272266304 + 13170775696 = 90952^2 + 114764^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443042003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2036750 + ... + 2047250.

Almost surely, 2^21443042000 is an apocalyptic number.

21443042000 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 21443042000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25952500392).

21443042000 is an abundant number, since it is smaller than the sum of its proper divisors (30461958784).

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

21443042000 is a wasteful number, since it uses less digits than its factorization.

21443042000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11545 (or 11529 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21443042000 its reverse (24034412), we get a palindrome (21467076412).

The spelling of 21443042000 in words is "twenty-one billion, four hundred forty-three million, forty-two thousand".