21321311311 has 16 divisors (see below), whose sum is σ = 22690938240. Its totient is φ = 19964736000.

The previous prime is 21321311267. The next prime is 21321311321. The reversal of 21321311311 is 11311312312.

It is a cyclic number.

It is not a de Polignac number, because 21321311311 - 2¹⁵ = 21321278543 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 (21321311321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3533445 + ... + 3539473.

It is an arithmetic number, because the mean of its divisors is an integer number (1418183640).

Almost surely, 2^21321311311 is an apocalyptic number.

21321311311 is a deficient number, since it is larger than the sum of its proper divisors (1369626929).

21321311311 is a wasteful number, since it uses less digits than its factorization.

21321311311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074.

The product of its digits is 108, while the sum is 19.

Adding to 21321311311 its reverse (11311312312), we get a palindrome (32632623623).

The spelling of 21321311311 in words is "twenty-one billion, three hundred twenty-one million, three hundred eleven thousand, three hundred eleven".