17212052221 has 32 divisors (see below), whose sum is σ = 22014720000. Its totient is φ = 13090256640.

The previous prime is 17212052147. The next prime is 17212052233. The reversal of 17212052221 is 12225021271.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 17212052221 - 2⁹ = 17212051709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17212052261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399855 + ... + 440803.

It is an arithmetic number, because the mean of its divisors is an integer number (687960000).

Almost surely, 2^17212052221 is an apocalyptic number.

It is an amenable number.

17212052221 is a deficient number, since it is larger than the sum of its proper divisors (4802667779).

17212052221 is a wasteful number, since it uses less digits than its factorization.

17212052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41149.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 17212052221 its reverse (12225021271), we get a palindrome (29437073492).

The spelling of 17212052221 in words is "seventeen billion, two hundred twelve million, fifty-two thousand, two hundred twenty-one".