16821170255044 has 81 divisors (see below), whose sum is σ = 30826828713261. Its totient is φ = 8031123013920.

The previous prime is 16821170255039. The next prime is 16821170255051. The reversal of 16821170255044 is 44055207112861.

The square root of 16821170255044 is 4101362.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8156907360900 + 8664262894144 = 2856030^2 + 2943512^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16821170254985 and 16821170255003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21105608454 + ... + 21105609250.

Almost surely, 2^{16821170255044} is an apocalyptic number.

16821170255044 is the 4101362-nd square number.

It is an amenable number.

16821170255044 is a deficient number, since it is larger than the sum of its proper divisors (14005658458217).

16821170255044 is an frugal number, since it uses more digits than its factorization.

16821170255044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826 (or 913 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 16821170255044 in words is "sixteen trillion, eight hundred twenty-one billion, one hundred seventy million, two hundred fifty-five thousand, forty-four".