13200020021 has 2 divisors, whose sum is σ = 13200020022. Its totient is φ = 13200020020.

The previous prime is 13200020017. The next prime is 13200020033. The reversal of 13200020021 is 12002000231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12628140625 + 571879396 = 112375^2 + 23914^2 .

It is a cyclic number.

It is not a de Polignac number, because 13200020021 - 2² = 13200020017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13200019984 and 13200020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13200020221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6600010010 + 6600010011.

It is an arithmetic number, because the mean of its divisors is an integer number (6600010011).

Almost surely, 2^13200020021 is an apocalyptic number.

It is an amenable number.

13200020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13200020021 is an equidigital number, since it uses as much as digits as its factorization.

13200020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 13200020021 its reverse (12002000231), we get a palindrome (25202020252).

The spelling of 13200020021 in words is "thirteen billion, two hundred million, twenty thousand, twenty-one".