21342342303 has 6 divisors (see below), whose sum is σ = 30827827784. Its totient is φ = 14228228196.

The previous prime is 21342342289. The next prime is 21342342323. The reversal of 21342342303 is 30324324312.

21342342303 is a `hidden beast` number, since 2 + 1 + 3 + 423 + 4 + 230 + 3 = 666.

It is not a de Polignac number, because 21342342303 - 2⁶ = 21342342239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342342323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185685675 + ... + 1185685692.

Almost surely, 2^21342342303 is an apocalyptic number.

21342342303 is a deficient number, since it is larger than the sum of its proper divisors (9485485481).

21342342303 is a wasteful number, since it uses less digits than its factorization.

21342342303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371371373 (or 2371371370 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21342342303 its reverse (30324324312), we get a palindrome (51666666615).

The spelling of 21342342303 in words is "twenty-one billion, three hundred forty-two million, three hundred forty-two thousand, three hundred three".