21342311343 has 24 divisors (see below), whose sum is σ = 32653732176. Its totient is φ = 13386105600.

The previous prime is 21342311327. The next prime is 21342311371. The reversal of 21342311343 is 34311324312.

It is a happy number.

21342311343 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 2 + 311 + 343 = 666.

It is not a de Polignac number, because 21342311343 - 2⁴ = 21342311327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342311443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393928 + ... + 444818.

It is an arithmetic number, because the mean of its divisors is an integer number (1360572174).

Almost surely, 2^21342311343 is an apocalyptic number.

21342311343 is a deficient number, since it is larger than the sum of its proper divisors (11311420833).

21342311343 is a wasteful number, since it uses less digits than its factorization.

21342311343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53655 (or 53652 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21342311343 its reverse (34311324312), we get a palindrome (55653635655).

The spelling of 21342311343 in words is "twenty-one billion, three hundred forty-two million, three hundred eleven thousand, three hundred forty-three".