221064601573 has 2 divisors, whose sum is σ = 221064601574. Its totient is φ = 221064601572.

The previous prime is 221064601519. The next prime is 221064601601. The reversal of 221064601573 is 375106460122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119241067969 + 101823533604 = 345313^2 + 319098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221064601573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221064671573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110532300786 + 110532300787.

It is an arithmetic number, because the mean of its divisors is an integer number (110532300787).

Almost surely, 2^221064601573 is an apocalyptic number.

It is an amenable number.

221064601573 is a deficient number, since it is larger than the sum of its proper divisors (1).

221064601573 is an equidigital number, since it uses as much as digits as its factorization.

221064601573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 221064601573 in words is "two hundred twenty-one billion, sixty-four million, six hundred one thousand, five hundred seventy-three".