221421255444617 has 2 divisors, whose sum is σ = 221421255444618. Its totient is φ = 221421255444616.

The previous prime is 221421255444607. The next prime is 221421255444643. The reversal of 221421255444617 is 716444552124122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201454335158521 + 19966920286096 = 14193461^2 + 4468436^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421255444617 - 2⁶ = 221421255444553 is a prime.

It is not a weakly prime, because it can be changed into another prime (221421255444607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710627722308 + 110710627722309.

It is an arithmetic number, because the mean of its divisors is an integer number (110710627722309).

Almost surely, 2^{221421255444617} is an apocalyptic number.

It is an amenable number.

221421255444617 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421255444617 is an equidigital number, since it uses as much as digits as its factorization.

221421255444617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4300800, while the sum is 50.

The spelling of 221421255444617 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, six hundred seventeen".