16443412721721 has 12 divisors (see below), whose sum is σ = 24256949263872. Its totient is φ = 10729035250776.

The previous prime is 16443412721669. The next prime is 16443412721741. The reversal of 16443412721721 is 12712721434461.

16443412721721 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 341 + 272 + 17 + 21 = 666.

16443412721721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16443412721721 - 2⁹ = 16443412721209 is a prime.

It is a super-3 number, since 3×16443412721721³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16443412721741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19436657641 + ... + 19436658486.

It is an arithmetic number, because the mean of its divisors is an integer number (2021412438656).

Almost surely, 2^{16443412721721} is an apocalyptic number.

It is an amenable number.

16443412721721 is a deficient number, since it is larger than the sum of its proper divisors (7813536542151).

16443412721721 is a wasteful number, since it uses less digits than its factorization.

16443412721721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38873316180 (or 38873316177 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 16443412721721 in words is "sixteen trillion, four hundred forty-three billion, four hundred twelve million, seven hundred twenty-one thousand, seven hundred twenty-one".