1066347210221 has 2 divisors, whose sum is σ = 1066347210222. Its totient is φ = 1066347210220.

The previous prime is 1066347210191. The next prime is 1066347210283. The reversal of 1066347210221 is 1220127436601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998650455625 + 67696754596 = 999325^2 + 260186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066347210221 - 2²⁶ = 1066280101357 is a prime.

It is a super-2 number, since 2×1066347210221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066347210421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533173605110 + 533173605111.

It is an arithmetic number, because the mean of its divisors is an integer number (533173605111).

Almost surely, 2^{1066347210221} is an apocalyptic number.

It is an amenable number.

1066347210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066347210221 is an equidigital number, since it uses as much as digits as its factorization.

1066347210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 1066347210221 in words is "one trillion, sixty-six billion, three hundred forty-seven million, two hundred ten thousand, two hundred twenty-one".