21330312311 has 32 divisors (see below), whose sum is σ = 27297824256. Its totient is φ = 16186320000.

The previous prime is 21330312281. The next prime is 21330312317. The reversal of 21330312311 is 11321303312.

It is a cyclic number.

It is not a de Polignac number, because 21330312311 - 2¹⁰ = 21330311287 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 (21330312317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 451916 + ... + 496878.

It is an arithmetic number, because the mean of its divisors is an integer number (853057008).

Almost surely, 2^21330312311 is an apocalyptic number.

21330312311 is a deficient number, since it is larger than the sum of its proper divisors (5967511945).

21330312311 is a wasteful number, since it uses less digits than its factorization.

21330312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45143.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21330312311 its reverse (11321303312), we get a palindrome (32651615623).

The spelling of 21330312311 in words is "twenty-one billion, three hundred thirty million, three hundred twelve thousand, three hundred eleven".