21341111311 has 4 divisors (see below), whose sum is σ = 22982735272. Its totient is φ = 19699487352.

The previous prime is 21341111293. The next prime is 21341111317. The reversal of 21341111311 is 11311114312.

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 21341111311 - 2¹⁷ = 21340980239 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 (21341111317) 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, 820811961 + ... + 820811986.

It is an arithmetic number, because the mean of its divisors is an integer number (5745683818).

Almost surely, 2^21341111311 is an apocalyptic number.

21341111311 is a deficient number, since it is larger than the sum of its proper divisors (1641623961).

21341111311 is a wasteful number, since it uses less digits than its factorization.

21341111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641623960.

The product of its digits is 72, while the sum is 19.

Adding to 21341111311 its reverse (11311114312), we get a palindrome (32652225623).

The spelling of 21341111311 in words is "twenty-one billion, three hundred forty-one million, one hundred eleven thousand, three hundred eleven".