21320202322013 has 6 divisors (see below), whose sum is σ = 24801051680766. Its totient is φ = 18274459133112.

The previous prime is 21320202321997. The next prime is 21320202322049. The reversal of 21320202322013 is 31022320202312.

It can be written as a sum of positive squares in only one way, i.e., 11097839520964 + 10222362801049 = 3331342^2 + 3197243^2 .

It is not a de Polignac number, because 21320202322013 - 2⁴ = 21320202321997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21320202322013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320202325013) 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 5 ways as a sum of consecutive naturals, for example, 217553084870 + ... + 217553084967.

It is an arithmetic number, because the mean of its divisors is an integer number (4133508613461).

Almost surely, 2^{21320202322013} is an apocalyptic number.

It is an amenable number.

21320202322013 is a deficient number, since it is larger than the sum of its proper divisors (3480849358753).

21320202322013 is an equidigital number, since it uses as much as digits as its factorization.

21320202322013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435106169851 (or 435106169844 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21320202322013 its reverse (31022320202312), we get a palindrome (52342522524325).

The spelling of 21320202322013 in words is "twenty-one trillion, three hundred twenty billion, two hundred two million, three hundred twenty-two thousand, thirteen".