16442134512721 has 2 divisors, whose sum is σ = 16442134512722. Its totient is φ = 16442134512720.

The previous prime is 16442134512707. The next prime is 16442134512737. The reversal of 16442134512721 is 12721543124461.

16442134512721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13888210902721 + 2553923610000 = 3726689^2 + 1598100^2 .

It is a cyclic number.

It is not a de Polignac number, because 16442134512721 - 2⁵ = 16442134512689 is a prime.

It is a super-3 number, since 3×16442134512721³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (16442134512701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221067256360 + 8221067256361.

It is an arithmetic number, because the mean of its divisors is an integer number (8221067256361).

Almost surely, 2^{16442134512721} is an apocalyptic number.

It is an amenable number.

16442134512721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442134512721 is an equidigital number, since it uses as much as digits as its factorization.

16442134512721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The spelling of 16442134512721 in words is "sixteen trillion, four hundred forty-two billion, one hundred thirty-four million, five hundred twelve thousand, seven hundred twenty-one".