221000221020217 has 2 divisors, whose sum is σ = 221000221020218. Its totient is φ = 221000221020216.

The previous prime is 221000221020119. The next prime is 221000221020233. The reversal of 221000221020217 is 712020122000122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218784005239801 + 2216215780416 = 14791349^2 + 1488696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000221020217 is a prime.

It is not a weakly prime, because it can be changed into another prime (221000221020017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500110510108 + 110500110510109.

It is an arithmetic number, because the mean of its divisors is an integer number (110500110510109).

Almost surely, 2^{221000221020217} is an apocalyptic number.

It is an amenable number.

221000221020217 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000221020217 is an equidigital number, since it uses as much as digits as its factorization.

221000221020217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 221000221020217 its reverse (712020122000122), we get a palindrome (933020343020339).

The spelling of 221000221020217 in words is "two hundred twenty-one trillion, two hundred twenty-one million, twenty thousand, two hundred seventeen".