16287763664221 has 8 divisors (see below), whose sum is σ = 18930088520640. Its totient is φ = 13724314176768.

The previous prime is 16287763664171. The next prime is 16287763664239. The reversal of 16287763664221 is 12246636778261.

16287763664221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16287763664221 - 2²¹ = 16287761567069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16287763664221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16287763664261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19718841796 + ... + 19718842621.

It is an arithmetic number, because the mean of its divisors is an integer number (2366261065080).

Almost surely, 2^{16287763664221} is an apocalyptic number.

It is an amenable number.

16287763664221 is a deficient number, since it is larger than the sum of its proper divisors (2642324856419).

16287763664221 is an equidigital number, since it uses as much as digits as its factorization.

16287763664221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39437684483.

The product of its digits is 48771072, while the sum is 61.

The spelling of 16287763664221 in words is "sixteen trillion, two hundred eighty-seven billion, seven hundred sixty-three million, six hundred sixty-four thousand, two hundred twenty-one".