221704113354217 has 16 divisors (see below), whose sum is σ = 252882654892560. Its totient is φ = 192550937812992.

The previous prime is 221704113354197. The next prime is 221704113354247. The reversal of 221704113354217 is 712453311407122.

It can be written as a sum of positive squares in 8 ways, for example, as 4548405024601 + 217155708329616 = 2132699^2 + 14736204^2 .

It is a cyclic number.

It is not a de Polignac number, because 221704113354217 - 2⁴³ = 212908020332009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221704113354247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157580818 + ... + 158981515.

It is an arithmetic number, because the mean of its divisors is an integer number (15805165930785).

Almost surely, 2^{221704113354217} is an apocalyptic number.

It is an amenable number.

221704113354217 is a deficient number, since it is larger than the sum of its proper divisors (31178541538343).

221704113354217 is a wasteful number, since it uses less digits than its factorization.

221704113354217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316565532.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 221704113354217 in words is "two hundred twenty-one trillion, seven hundred four billion, one hundred thirteen million, three hundred fifty-four thousand, two hundred seventeen".