221421327266617 has 2 divisors, whose sum is σ = 221421327266618. Its totient is φ = 221421327266616.

The previous prime is 221421327266611. The next prime is 221421327266663. The reversal of 221421327266617 is 716662723124122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208736931048361 + 12684396218256 = 14447731^2 + 3561516^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421327266617 - 2³⁹ = 220871571452729 is a prime.

It is not a weakly prime, because it can be changed into another prime (221421327266611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710663633308 + 110710663633309.

It is an arithmetic number, because the mean of its divisors is an integer number (110710663633309).

Almost surely, 2^{221421327266617} is an apocalyptic number.

It is an amenable number.

221421327266617 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421327266617 is an equidigital number, since it uses as much as digits as its factorization.

221421327266617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 52.

The spelling of 221421327266617 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, three hundred twenty-seven million, two hundred sixty-six thousand, six hundred seventeen".