13320042121 has 2 divisors, whose sum is σ = 13320042122. Its totient is φ = 13320042120.

The previous prime is 13320042107. The next prime is 13320042139. The reversal of 13320042121 is 12124002331.

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., 7167992896 + 6152049225 = 84664^2 + 78435^2 .

It is a cyclic number.

It is not a de Polignac number, because 13320042121 - 2¹⁷ = 13319911049 is a prime.

It is not a weakly prime, because it can be changed into another prime (13320042101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660021060 + 6660021061.

It is an arithmetic number, because the mean of its divisors is an integer number (6660021061).

Almost surely, 2^13320042121 is an apocalyptic number.

It is an amenable number.

13320042121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320042121 is an equidigital number, since it uses as much as digits as its factorization.

13320042121 is an evil number, because the sum of its binary digits is even.

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

Adding to 13320042121 its reverse (12124002331), we get a palindrome (25444044452).

The spelling of 13320042121 in words is "thirteen billion, three hundred twenty million, forty-two thousand, one hundred twenty-one".