21443011423 has 8 divisors (see below), whose sum is σ = 22184150400. Its totient is φ = 20701987488.

The previous prime is 21443011409. The next prime is 21443011433. The reversal of 21443011423 is 32411034412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21443011423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443011433) 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, 544233 + ... + 582301.

It is an arithmetic number, because the mean of its divisors is an integer number (2773018800).

Almost surely, 2^21443011423 is an apocalyptic number.

21443011423 is a deficient number, since it is larger than the sum of its proper divisors (741138977).

21443011423 is a wasteful number, since it uses less digits than its factorization.

21443011423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57521.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21443011423 its reverse (32411034412), we get a palindrome (53854045835).

The spelling of 21443011423 in words is "twenty-one billion, four hundred forty-three million, eleven thousand, four hundred twenty-three".