21320353201 has 6 divisors (see below), whose sum is σ = 24801227250. Its totient is φ = 18274588416.

The previous prime is 21320353193. The next prime is 21320353211. The reversal of 21320353201 is 10235302312.

It can be written as a sum of positive squares in only one way, i.e., 20743200625 + 577152576 = 144025^2 + 24024^2 .

It is not a de Polignac number, because 21320353201 - 2³ = 21320353193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320353211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217554576 + ... + 217554673.

It is an arithmetic number, because the mean of its divisors is an integer number (4133537875).

Almost surely, 2^21320353201 is an apocalyptic number.

It is an amenable number.

21320353201 is a deficient number, since it is larger than the sum of its proper divisors (3480874049).

21320353201 is an equidigital number, since it uses as much as digits as its factorization.

21320353201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435109263 (or 435109256 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21320353201 its reverse (10235302312), we get a palindrome (31555655513).

The spelling of 21320353201 in words is "twenty-one billion, three hundred twenty million, three hundred fifty-three thousand, two hundred one".