21342323423 has 8 divisors (see below), whose sum is σ = 22157978880. Its totient is φ = 20531982240.

The previous prime is 21342323419. The next prime is 21342323437. The reversal of 21342323423 is 32432324312.

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 21342323423 - 2² = 21342323419 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 (21342323473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1320383 + ... + 1336448.

It is an arithmetic number, because the mean of its divisors is an integer number (2769747360).

Almost surely, 2^21342323423 is an apocalyptic number.

21342323423 is a deficient number, since it is larger than the sum of its proper divisors (815655457).

21342323423 is a wasteful number, since it uses less digits than its factorization.

21342323423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657137.

The product of its digits is 20736, while the sum is 29.

Adding to 21342323423 its reverse (32432324312), we get a palindrome (53774647735).

The spelling of 21342323423 in words is "twenty-one billion, three hundred forty-two million, three hundred twenty-three thousand, four hundred twenty-three".