21300313021 has 16 divisors (see below), whose sum is σ = 23108964480. Its totient is φ = 19516282560.

The previous prime is 21300312961. The next prime is 21300313057. The reversal of 21300313021 is 12031300312.

It is a cyclic number.

It is not a de Polignac number, because 21300313021 - 2⁷ = 21300312893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300312986 and 21300313004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300313091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1771851 + ... + 1783831.

It is an arithmetic number, because the mean of its divisors is an integer number (1444310280).

Almost surely, 2^21300313021 is an apocalyptic number.

It is an amenable number.

21300313021 is a deficient number, since it is larger than the sum of its proper divisors (1808651459).

21300313021 is a wasteful number, since it uses less digits than its factorization.

21300313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12996.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21300313021 its reverse (12031300312), we get a palindrome (33331613333).

The spelling of 21300313021 in words is "twenty-one billion, three hundred million, three hundred thirteen thousand, twenty-one".