21342312311 has 4 divisors (see below), whose sum is σ = 21343144800. Its totient is φ = 21341479824.

The previous prime is 21342312301. The next prime is 21342312337. The reversal of 21342312311 is 11321324312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21342312311 - 2⁶ = 21342312247 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 (21342312301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376526 + ... + 429483.

It is an arithmetic number, because the mean of its divisors is an integer number (5335786200).

Almost surely, 2^21342312311 is an apocalyptic number.

21342312311 is a deficient number, since it is larger than the sum of its proper divisors (832489).

21342312311 is an equidigital number, since it uses as much as digits as its factorization.

21342312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832488.

The product of its digits is 864, while the sum is 23.

Adding to 21342312311 its reverse (11321324312), we get a palindrome (32663636623).

The spelling of 21342312311 in words is "twenty-one billion, three hundred forty-two million, three hundred twelve thousand, three hundred eleven".