21300310021 has 16 divisors (see below), whose sum is σ = 23873572800. Its totient is φ = 18905902848.

The previous prime is 21300310013. The next prime is 21300310027. The reversal of 21300310021 is 12001300312.

It is a cyclic number.

It is not a de Polignac number, because 21300310021 - 2³ = 21300310013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300309983 and 21300310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300310027) 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, 481191 + ... + 523588.

It is an arithmetic number, because the mean of its divisors is an integer number (1492098300).

Almost surely, 2^21300310021 is an apocalyptic number.

It is an amenable number.

21300310021 is a deficient number, since it is larger than the sum of its proper divisors (2573262779).

21300310021 is a wasteful number, since it uses less digits than its factorization.

21300310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004868.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21300310021 its reverse (12001300312), we get a palindrome (33301610333).

The spelling of 21300310021 in words is "twenty-one billion, three hundred million, three hundred ten thousand, twenty-one".