13120020430021 has 2 divisors, whose sum is σ = 13120020430022. Its totient is φ = 13120020430020.

The previous prime is 13120020430019. The next prime is 13120020430037. The reversal of 13120020430021 is 12003402002131.

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., 12995203072996 + 124817357025 = 3604886^2 + 353295^2 .

It is a cyclic number.

It is not a de Polignac number, because 13120020430021 - 2¹ = 13120020430019 is a prime.

Together with 13120020430019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13120020430001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560010215010 + 6560010215011.

It is an arithmetic number, because the mean of its divisors is an integer number (6560010215011).

Almost surely, 2^{13120020430021} is an apocalyptic number.

It is an amenable number.

13120020430021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13120020430021 is an equidigital number, since it uses as much as digits as its factorization.

13120020430021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13120020430021 its reverse (12003402002131), we get a palindrome (25123422432152).

The spelling of 13120020430021 in words is "thirteen trillion, one hundred twenty billion, twenty million, four hundred thirty thousand, twenty-one".