221532375173 has 2 divisors, whose sum is σ = 221532375174. Its totient is φ = 221532375172.

The previous prime is 221532375157. The next prime is 221532375257. The reversal of 221532375173 is 371573235122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117589325569 + 103943049604 = 342913^2 + 322402^2 .

It is a cyclic number.

It is not a de Polignac number, because 221532375173 - 2⁴ = 221532375157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221532375173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221532375133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110766187586 + 110766187587.

It is an arithmetic number, because the mean of its divisors is an integer number (110766187587).

Almost surely, 2^221532375173 is an apocalyptic number.

It is an amenable number.

221532375173 is a deficient number, since it is larger than the sum of its proper divisors (1).

221532375173 is an equidigital number, since it uses as much as digits as its factorization.

221532375173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 41.

The spelling of 221532375173 in words is "two hundred twenty-one billion, five hundred thirty-two million, three hundred seventy-five thousand, one hundred seventy-three".