16442024121421 has 2 divisors, whose sum is σ = 16442024121422. Its totient is φ = 16442024121420.

The previous prime is 16442024121389. The next prime is 16442024121451. The reversal of 16442024121421 is 12412142024461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9648546776521 + 6793477344900 = 3106211^2 + 2606430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16442024121421 - 2⁵ = 16442024121389 is a prime.

It is a super-3 number, since 3×16442024121421³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16442024121451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221012060710 + 8221012060711.

It is an arithmetic number, because the mean of its divisors is an integer number (8221012060711).

Almost surely, 2^{16442024121421} is an apocalyptic number.

It is an amenable number.

16442024121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442024121421 is an equidigital number, since it uses as much as digits as its factorization.

16442024121421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 34.

Adding to 16442024121421 its reverse (12412142024461), we get a palindrome (28854166145882).

The spelling of 16442024121421 in words is "sixteen trillion, four hundred forty-two billion, twenty-four million, one hundred twenty-one thousand, four hundred twenty-one".