21300131513 has 4 divisors (see below), whose sum is σ = 21307308660. Its totient is φ = 21292954368.

The previous prime is 21300131477. The next prime is 21300131519. The reversal of 21300131513 is 31513100312.

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 1543861264 + 19756270249 = 39292^2 + 140557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300131513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300131519) 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, 3584120 + ... + 3590057.

It is an arithmetic number, because the mean of its divisors is an integer number (5326827165).

Almost surely, 2^21300131513 is an apocalyptic number.

It is an amenable number.

21300131513 is a deficient number, since it is larger than the sum of its proper divisors (7177147).

21300131513 is an equidigital number, since it uses as much as digits as its factorization.

21300131513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7177146.

The product of its (nonzero) digits is 270, while the sum is 20.

Adding to 21300131513 its reverse (31513100312), we get a palindrome (52813231825).

The spelling of 21300131513 in words is "twenty-one billion, three hundred million, one hundred thirty-one thousand, five hundred thirteen".