17143211221 has 8 divisors (see below), whose sum is σ = 17630588984. Its totient is φ = 16657099200.

The previous prime is 17143211219. The next prime is 17143211237. The reversal of 17143211221 is 12211234171.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14565110596 + 2578100625 = 120686^2 + 50775^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17143211221 - 2¹ = 17143211219 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 (17143211291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288930 + ... + 343171.

It is an arithmetic number, because the mean of its divisors is an integer number (2203823623).

Almost surely, 2^17143211221 is an apocalyptic number.

It is an amenable number.

17143211221 is a deficient number, since it is larger than the sum of its proper divisors (487377763).

17143211221 is an equidigital number, since it uses as much as digits as its factorization.

17143211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632871.

The product of its digits is 672, while the sum is 25.

Adding to 17143211221 its reverse (12211234171), we get a palindrome (29354445392).

The spelling of 17143211221 in words is "seventeen billion, one hundred forty-three million, two hundred eleven thousand, two hundred twenty-one".