16720356021443 has 4 divisors (see below), whose sum is σ = 16955853993648. Its totient is φ = 16484858049240.

The previous prime is 16720356021419. The next prime is 16720356021469. The reversal of 16720356021443 is 34412065302761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16720356021443 - 2⁶ = 16720356021379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16720356021394 and 16720356021403.

It is not an unprimeable number, because it can be changed into a prime (16720353021443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117748985996 + ... + 117748986137.

It is an arithmetic number, because the mean of its divisors is an integer number (4238963498412).

Almost surely, 2^{16720356021443} is an apocalyptic number.

16720356021443 is a deficient number, since it is larger than the sum of its proper divisors (235497972205).

16720356021443 is an equidigital number, since it uses as much as digits as its factorization.

16720356021443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235497972204.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 16720356021443 in words is "sixteen trillion, seven hundred twenty billion, three hundred fifty-six million, twenty-one thousand, four hundred forty-three".