21320320133201 has 4 divisors (see below), whose sum is σ = 22055503586100. Its totient is φ = 20585136680304.

The previous prime is 21320320133071. The next prime is 21320320133237. The reversal of 21320320133201 is 10233102302312.

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 8488342402576 + 12831977730625 = 2913476^2 + 3582175^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320320133201 - 2¹⁴ = 21320320116817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320320133261) 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, 367591726406 + ... + 367591726463.

It is an arithmetic number, because the mean of its divisors is an integer number (5513875896525).

Almost surely, 2^{21320320133201} is an apocalyptic number.

It is an amenable number.

21320320133201 is a deficient number, since it is larger than the sum of its proper divisors (735183452899).

21320320133201 is an equidigital number, since it uses as much as digits as its factorization.

21320320133201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735183452898.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21320320133201 its reverse (10233102302312), we get a palindrome (31553422435513).

The spelling of 21320320133201 in words is "twenty-one trillion, three hundred twenty billion, three hundred twenty million, one hundred thirty-three thousand, two hundred one".