1221704573 has 2 divisors, whose sum is σ = 1221704574. Its totient is φ = 1221704572.

The previous prime is 1221704557. The next prime is 1221704611. The reversal of 1221704573 is 3754071221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083923929 + 137780644 = 32923^2 + 11738^2 .

It is an emirp because it is prime and its reverse (3754071221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221704573 - 2⁴ = 1221704557 is a prime.

It is a super-2 number, since 2×1221704573² = 2985124127378224658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221704873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610852286 + 610852287.

It is an arithmetic number, because the mean of its divisors is an integer number (610852287).

Almost surely, 2^1221704573 is an apocalyptic number.

It is an amenable number.

1221704573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221704573 is an equidigital number, since it uses as much as digits as its factorization.

1221704573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 1221704573 is about 34952.8907674315. The cubic root of 1221704573 is about 1069.0271452610.

Adding to 1221704573 its reverse (3754071221), we get a palindrome (4975775794).

The spelling of 1221704573 in words is "one billion, two hundred twenty-one million, seven hundred four thousand, five hundred seventy-three".