16921055017441 has 3 divisors (see below), whose sum is σ = 16921059130963. Its totient is φ = 16921050903920.

The previous prime is 16921055017421. The next prime is 16921055017523. The reversal of 16921055017441 is 14471055012961.

The square root of 16921055017441 is 4113521.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8733673967841 + 8187381049600 = 2955279^2 + 2861360^2 .

It is not a de Polignac number, because 16921055017441 - 2⁴¹ = 14722031761889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16921055017391 and 16921055017400.

It is not an unprimeable number, because it can be changed into a prime (16921055017421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2056761 + ... + 6170281.

Almost surely, 2^{16921055017441} is an apocalyptic number.

16921055017441 is the 4113521-st square number.

16921055017441 is the 2056761-st centered octagonal number.

It is an amenable number.

16921055017441 is a deficient number, since it is larger than the sum of its proper divisors (4113522).

16921055017441 is an frugal number, since it uses more digits than its factorization.

16921055017441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227042 (or 4113521 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 16921055017441 in words is "sixteen trillion, nine hundred twenty-one billion, fifty-five million, seventeen thousand, four hundred forty-one".