13331320131721 has 2 divisors, whose sum is σ = 13331320131722. Its totient is φ = 13331320131720.

The previous prime is 13331320131709. The next prime is 13331320131743. The reversal of 13331320131721 is 12713102313331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13319660451321 + 11659680400 = 3649611^2 + 107980^2 .

It is a cyclic number.

It is not a de Polignac number, because 13331320131721 - 2¹³ = 13331320123529 is a prime.

It is not a weakly prime, because it can be changed into another prime (13331320131751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6665660065860 + 6665660065861.

It is an arithmetic number, because the mean of its divisors is an integer number (6665660065861).

Almost surely, 2^{13331320131721} is an apocalyptic number.

It is an amenable number.

13331320131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13331320131721 is an equidigital number, since it uses as much as digits as its factorization.

13331320131721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The spelling of 13331320131721 in words is "thirteen trillion, three hundred thirty-one billion, three hundred twenty million, one hundred thirty-one thousand, seven hundred twenty-one".