13001320021 has 2 divisors, whose sum is σ = 13001320022. Its totient is φ = 13001320020.

The previous prime is 13001320001. The next prime is 13001320037. The reversal of 13001320021 is 12002310031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10529838225 + 2471481796 = 102615^2 + 49714^2 .

It is an emirp because it is prime and its reverse (12002310031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13001320021 - 2⁷ = 13001319893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13001319983 and 13001320010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13001320001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6500660010 + 6500660011.

It is an arithmetic number, because the mean of its divisors is an integer number (6500660011).

Almost surely, 2^13001320021 is an apocalyptic number.

It is an amenable number.

13001320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13001320021 is an equidigital number, since it uses as much as digits as its factorization.

13001320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 13001320021 its reverse (12002310031), we get a palindrome (25003630052).

The spelling of 13001320021 in words is "thirteen billion, one million, three hundred twenty thousand, twenty-one".