21344031423 has 48 divisors (see below), whose sum is σ = 36240605856. Its totient is φ = 11933982720.

The previous prime is 21344031409. The next prime is 21344031451. The reversal of 21344031423 is 32413044312.

21344031423 is a `hidden beast` number, since 2 + 1 + 344 + 0 + 314 + 2 + 3 = 666.

It is not a de Polignac number, because 21344031423 - 2⁸ = 21344031167 is a prime.

It is a super-2 number, since 2×21344031423² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344031473) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3055711 + ... + 3062687.

It is an arithmetic number, because the mean of its divisors is an integer number (755012622).

Almost surely, 2^21344031423 is an apocalyptic number.

21344031423 is a deficient number, since it is larger than the sum of its proper divisors (14896574433).

21344031423 is a wasteful number, since it uses less digits than its factorization.

21344031423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384 (or 9381 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21344031423 its reverse (32413044312), we get a palindrome (53757075735).

The spelling of 21344031423 in words is "twenty-one billion, three hundred forty-four million, thirty-one thousand, four hundred twenty-three".