1705888842221 has 4 divisors (see below), whose sum is σ = 1712230436700. Its totient is φ = 1699547247744.

The previous prime is 1705888842209. The next prime is 1705888842223. The reversal of 1705888842221 is 1222488885071.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1005980916196 + 699907926025 = 1002986^2 + 836605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1705888842221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1705888842223) 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, 3170796836 + ... + 3170797373.

It is an arithmetic number, because the mean of its divisors is an integer number (428057609175).

Almost surely, 2^{1705888842221} is an apocalyptic number.

It is an amenable number.

1705888842221 is a deficient number, since it is larger than the sum of its proper divisors (6341594479).

1705888842221 is an equidigital number, since it uses as much as digits as its factorization.

1705888842221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341594478.

The product of its (nonzero) digits is 4587520, while the sum is 56.

The spelling of 1705888842221 in words is "one trillion, seven hundred five billion, eight hundred eighty-eight million, eight hundred forty-two thousand, two hundred twenty-one".