21443760001 has 8 divisors (see below), whose sum is σ = 21742249320. Its totient is φ = 21145398912.

The previous prime is 21443759977. The next prime is 21443760043. The reversal of 21443760001 is 10006734412.

It can be written as a sum of positive squares in 4 ways, for example, as 7582229776 + 13861530225 = 87076^2 + 117735^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21443760001 - 2⁵ = 21443759969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443760061) 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 7 ways as a sum of consecutive naturals, for example, 333495 + ... + 392563.

It is an arithmetic number, because the mean of its divisors is an integer number (2717781165).

Almost surely, 2^21443760001 is an apocalyptic number.

It is an amenable number.

21443760001 is a deficient number, since it is larger than the sum of its proper divisors (298489319).

21443760001 is an equidigital number, since it uses as much as digits as its factorization.

21443760001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64115.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 21443760001 in words is "twenty-one billion, four hundred forty-three million, seven hundred sixty thousand, one".