21443042001 has 8 divisors (see below), whose sum is σ = 29017450144. Its totient is φ = 14081997600.

The previous prime is 21443041981. The next prime is 21443042003. The reversal of 21443042001 is 10024034412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21443042001 - 2⁶ = 21443041937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443042003) 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, 53340700 + ... + 53341101.

It is an arithmetic number, because the mean of its divisors is an integer number (3627181268).

Almost surely, 2^21443042001 is an apocalyptic number.

It is an amenable number.

21443042001 is a deficient number, since it is larger than the sum of its proper divisors (7574408143).

21443042001 is a wasteful number, since it uses less digits than its factorization.

21443042001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106681871.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21443042001 its reverse (10024034412), we get a palindrome (31467076413).

The spelling of 21443042001 in words is "twenty-one billion, four hundred forty-three million, forty-two thousand, one".