21043023423 has 8 divisors (see below), whose sum is σ = 28058544000. Its totient is φ = 14028092568.

The previous prime is 21043023409. The next prime is 21043023433. The reversal of 21043023423 is 32432034012.

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

It is not a de Polignac number, because 21043023423 - 2⁹ = 21043022911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043023393 and 21043023402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043023433) 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, 56083 + ... + 212676.

It is an arithmetic number, because the mean of its divisors is an integer number (3507318000).

Almost surely, 2^21043023423 is an apocalyptic number.

21043023423 is a deficient number, since it is larger than the sum of its proper divisors (7015520577).

21043023423 is a wasteful number, since it uses less digits than its factorization.

21043023423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294861.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21043023423 its reverse (32432034012), we get a palindrome (53475057435).

The spelling of 21043023423 in words is "twenty-one billion, forty-three million, twenty-three thousand, four hundred twenty-three".