21300024013 has 4 divisors (see below), whose sum is σ = 22552966620. Its totient is φ = 20047081408.

The previous prime is 21300024007. The next prime is 21300024017. The reversal of 21300024013 is 31042000312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6595551369 + 14704472644 = 81213^2 + 121262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300024013 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 (21300024017) 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, 626471278 + ... + 626471311.

It is an arithmetic number, because the mean of its divisors is an integer number (5638241655).

Almost surely, 2^21300024013 is an apocalyptic number.

It is an amenable number.

21300024013 is a deficient number, since it is larger than the sum of its proper divisors (1252942607).

21300024013 is a wasteful number, since it uses less digits than its factorization.

21300024013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252942606.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21300024013 its reverse (31042000312), we get a palindrome (52342024325).

The spelling of 21300024013 in words is "twenty-one billion, three hundred million, twenty-four thousand, thirteen".