21344411423 has 16 divisors (see below), whose sum is σ = 22912243200. Its totient is φ = 19845540960.

The previous prime is 21344411399. The next prime is 21344411437. The reversal of 21344411423 is 32411444312.

It is a cyclic number.

It is not a de Polignac number, because 21344411423 - 2¹⁶ = 21344345887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344411443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32003 + ... + 209076.

It is an arithmetic number, because the mean of its divisors is an integer number (1432015200).

Almost surely, 2^21344411423 is an apocalyptic number.

21344411423 is a deficient number, since it is larger than the sum of its proper divisors (1567831777).

21344411423 is a wasteful number, since it uses less digits than its factorization.

21344411423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241222.

The product of its digits is 9216, while the sum is 29.

Adding to 21344411423 its reverse (32411444312), we get a palindrome (53755855735).

The spelling of 21344411423 in words is "twenty-one billion, three hundred forty-four million, four hundred eleven thousand, four hundred twenty-three".