13440404424221 has 2 divisors, whose sum is σ = 13440404424222. Its totient is φ = 13440404424220.

The previous prime is 13440404424191. The next prime is 13440404424229. The reversal of 13440404424221 is 12242440404431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11703309420100 + 1737095004121 = 3421010^2 + 1317989^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440404424221 - 2¹⁸ = 13440404162077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13440404424229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6720202212110 + 6720202212111.

It is an arithmetic number, because the mean of its divisors is an integer number (6720202212111).

Almost surely, 2^{13440404424221} is an apocalyptic number.

It is an amenable number.

13440404424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13440404424221 is an equidigital number, since it uses as much as digits as its factorization.

13440404424221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98304, while the sum is 35.

Adding to 13440404424221 its reverse (12242440404431), we get a palindrome (25682844828652).

The spelling of 13440404424221 in words is "thirteen trillion, four hundred forty billion, four hundred four million, four hundred twenty-four thousand, two hundred twenty-one".