21344123541 has 48 divisors (see below), whose sum is σ = 31403151360. Its totient is φ = 12886885440.

The previous prime is 21344123513. The next prime is 21344123573. The reversal of 21344123541 is 14532144312.

It is not a de Polignac number, because 21344123541 - 2¹⁰ = 21344122517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21344123499 and 21344123508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344123501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6687256 + ... + 6690446.

It is an arithmetic number, because the mean of its divisors is an integer number (654232320).

Almost surely, 2^21344123541 is an apocalyptic number.

It is an amenable number.

21344123541 is a deficient number, since it is larger than the sum of its proper divisors (10059027819).

21344123541 is a wasteful number, since it uses less digits than its factorization.

21344123541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466 (or 3453 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

Adding to 21344123541 its reverse (14532144312), we get a palindrome (35876267853).

The spelling of 21344123541 in words is "twenty-one billion, three hundred forty-four million, one hundred twenty-three thousand, five hundred forty-one".