21330030311 has 4 divisors (see below), whose sum is σ = 21587018712. Its totient is φ = 21073041912.

The previous prime is 21330030289. The next prime is 21330030343. The reversal of 21330030311 is 11303003312.

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 21330030311 - 2³⁰ = 20256288487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330030311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330030391) 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, 128494076 + ... + 128494241.

It is an arithmetic number, because the mean of its divisors is an integer number (5396754678).

Almost surely, 2^21330030311 is an apocalyptic number.

21330030311 is a deficient number, since it is larger than the sum of its proper divisors (256988401).

21330030311 is an equidigital number, since it uses as much as digits as its factorization.

21330030311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256988400.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21330030311 its reverse (11303003312), we get a palindrome (32633033623).

The spelling of 21330030311 in words is "twenty-one billion, three hundred thirty million, thirty thousand, three hundred eleven".