17228332721 has 4 divisors (see below), whose sum is σ = 17239456500. Its totient is φ = 17217208944.

The previous prime is 17228332699. The next prime is 17228332733. The reversal of 17228332721 is 12723382271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12723382271 = 1097 ⋅11598343.

It can be written as a sum of positive squares in 2 ways, for example, as 13616322721 + 3612010000 = 116689^2 + 60100^2 .

It is a cyclic number.

It is not a de Polignac number, because 17228332721 - 2¹⁸ = 17228070577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17228332741) 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 3 ways as a sum of consecutive naturals, for example, 5559566 + ... + 5562663.

It is an arithmetic number, because the mean of its divisors is an integer number (4309864125).

Almost surely, 2^17228332721 is an apocalyptic number.

It is an amenable number.

17228332721 is a deficient number, since it is larger than the sum of its proper divisors (11123779).

17228332721 is a wasteful number, since it uses less digits than its factorization.

17228332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123778.

The product of its digits is 56448, while the sum is 38.

The spelling of 17228332721 in words is "seventeen billion, two hundred twenty-eight million, three hundred thirty-two thousand, seven hundred twenty-one".