13220020120261 has 2 divisors, whose sum is σ = 13220020120262. Its totient is φ = 13220020120260.

The previous prime is 13220020120199. The next prime is 13220020120277. The reversal of 13220020120261 is 16202102002231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12141809940100 + 1078210180161 = 3484510^2 + 1038369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13220020120261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220020120061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610010060130 + 6610010060131.

It is an arithmetic number, because the mean of its divisors is an integer number (6610010060131).

Almost surely, 2^{13220020120261} is an apocalyptic number.

It is an amenable number.

13220020120261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220020120261 is an equidigital number, since it uses as much as digits as its factorization.

13220020120261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 13220020120261 its reverse (16202102002231), we get a palindrome (29422122122492).

The spelling of 13220020120261 in words is "thirteen trillion, two hundred twenty billion, twenty million, one hundred twenty thousand, two hundred sixty-one".