21321312311 has 8 divisors (see below), whose sum is σ = 23102283120. Its totient is φ = 19560465792.

The previous prime is 21321312281. The next prime is 21321312349. The reversal of 21321312311 is 11321312312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21321312311 - 2¹⁴ = 21321295927 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 (21321312391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5028866 + ... + 5033103.

It is an arithmetic number, because the mean of its divisors is an integer number (2887785390).

Almost surely, 2^21321312311 is an apocalyptic number.

21321312311 is a deficient number, since it is larger than the sum of its proper divisors (1780970809).

21321312311 is a wasteful number, since it uses less digits than its factorization.

21321312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10062145.

The product of its digits is 216, while the sum is 20.

Adding to 21321312311 its reverse (11321312312), we get a palindrome (32642624623).

Subtracting from 21321312311 its reverse (11321312312), we obtain a palindrome (9999999999).

The spelling of 21321312311 in words is "twenty-one billion, three hundred twenty-one million, three hundred twelve thousand, three hundred eleven".