21444423001 has 8 divisors (see below), whose sum is σ = 21552668424. Its totient is φ = 21336416640.

The previous prime is 21444422971. The next prime is 21444423019. The reversal of 21444423001 is 10032444412.

It can be written as a sum of positive squares in 4 ways, for example, as 3508785225 + 17935637776 = 59235^2 + 133924^2 .

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 21444423001 - 2²⁹ = 20907552089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444423061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121471 + ... + 240091.

It is an arithmetic number, because the mean of its divisors is an integer number (2694083553).

Almost surely, 2^21444423001 is an apocalyptic number.

It is an amenable number.

21444423001 is a deficient number, since it is larger than the sum of its proper divisors (108245423).

21444423001 is a wasteful number, since it uses less digits than its factorization.

21444423001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119531.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21444423001 its reverse (10032444412), we get a palindrome (31476867413).

The spelling of 21444423001 in words is "twenty-one billion, four hundred forty-four million, four hundred twenty-three thousand, one".