21300021513 has 24 divisors (see below), whose sum is σ = 31387015296. Its totient is φ = 13916112000.

The previous prime is 21300021499. The next prime is 21300021521. The reversal of 21300021513 is 31512000312.

21300021513 is a `hidden beast` number, since 2 + 130 + 0 + 0 + 21 + 513 = 666.

It is not a de Polignac number, because 21300021513 - 2²⁹ = 20763150601 is a prime.

21300021513 is a modest number, since divided by 21513 gives 213 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21300021563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6913 + ... + 206513.

It is an arithmetic number, because the mean of its divisors is an integer number (1307792304).

Almost surely, 2^21300021513 is an apocalyptic number.

It is an amenable number.

21300021513 is a deficient number, since it is larger than the sum of its proper divisors (10086993783).

21300021513 is a wasteful number, since it uses less digits than its factorization.

21300021513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199845 (or 199842 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21300021513 its reverse (31512000312), we get a palindrome (52812021825).

The spelling of 21300021513 in words is "twenty-one billion, three hundred million, twenty-one thousand, five hundred thirteen".