21300321213 has 6 divisors (see below), whose sum is σ = 30767130654. Its totient is φ = 14200214136.

The previous prime is 21300321199. The next prime is 21300321223. The reversal of 21300321213 is 31212300312.

21300321213 is a `hidden beast` number, since 2 + 130 + 0 + 321 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19544878809 + 1755442404 = 139803^2 + 41898^2 .

It is not a de Polignac number, because 21300321213 - 2⁸ = 21300320957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300321223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183351170 + ... + 1183351187.

It is an arithmetic number, because the mean of its divisors is an integer number (5127855109).

Almost surely, 2^21300321213 is an apocalyptic number.

It is an amenable number.

21300321213 is a deficient number, since it is larger than the sum of its proper divisors (9466809441).

21300321213 is a wasteful number, since it uses less digits than its factorization.

21300321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366702363 (or 2366702360 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21300321213 its reverse (31212300312), we get a palindrome (52512621525).

The spelling of 21300321213 in words is "twenty-one billion, three hundred million, three hundred twenty-one thousand, two hundred thirteen".