17701045122121 has 3 divisors (see below), whose sum is σ = 17701049329383. Its totient is φ = 17701040914860.

The previous prime is 17701045122119. The next prime is 17701045122193. The reversal of 17701045122121 is 12122154010771.

The square root of 17701045122121 is 4207261.

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., 17621012712121 + 80032410000 = 4197739^2 + 282900^2 .

It is not a de Polignac number, because 17701045122121 - 2¹ = 17701045122119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17701040122121) 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, 2103631 + ... + 6310891.

It is an arithmetic number, because the mean of its divisors is an integer number (5900349776461).

Almost surely, 2^{17701045122121} is an apocalyptic number.

17701045122121 is the 4207261-st square number.

17701045122121 is the 2103631-st centered octagonal number.

It is an amenable number.

17701045122121 is a deficient number, since it is larger than the sum of its proper divisors (4207262).

17701045122121 is an frugal number, since it uses more digits than its factorization.

17701045122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414522 (or 4207261 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 34.

Adding to 17701045122121 its reverse (12122154010771), we get a palindrome (29823199132892).

The spelling of 17701045122121 in words is "seventeen trillion, seven hundred one billion, forty-five million, one hundred twenty-two thousand, one hundred twenty-one".