16442663474221 has 4 divisors (see below), whose sum is σ = 16442895841792. Its totient is φ = 16442431106652.

The previous prime is 16442663474173. The next prime is 16442663474243. The reversal of 16442663474221 is 12247436624461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16442663474221 - 2¹¹ = 16442663472173 is a prime.

It is a super-3 number, since 3×16442663474221³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16442663474261) 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, 116077611 + ... + 116219176.

It is an arithmetic number, because the mean of its divisors is an integer number (4110723960448).

Almost surely, 2^{16442663474221} is an apocalyptic number.

It is an amenable number.

16442663474221 is a deficient number, since it is larger than the sum of its proper divisors (232367571).

16442663474221 is an equidigital number, since it uses as much as digits as its factorization.

16442663474221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232367570.

The product of its digits is 9289728, while the sum is 52.

The spelling of 16442663474221 in words is "sixteen trillion, four hundred forty-two billion, six hundred sixty-three million, four hundred seventy-four thousand, two hundred twenty-one".