1273065221 has 2 divisors, whose sum is σ = 1273065222. Its totient is φ = 1273065220.

The previous prime is 1273065217. The next prime is 1273065289. The reversal of 1273065221 is 1225603721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1269496900 + 3568321 = 35630^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273065221 - 2² = 1273065217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273065121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636532610 + 636532611.

It is an arithmetic number, because the mean of its divisors is an integer number (636532611).

Almost surely, 2^1273065221 is an apocalyptic number.

It is an amenable number.

1273065221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273065221 is an equidigital number, since it uses as much as digits as its factorization.

1273065221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1273065221 is about 35680.0395319288. The cubic root of 1273065221 is about 1083.8026733426.

Adding to 1273065221 its reverse (1225603721), we get a palindrome (2498668942).

The spelling of 1273065221 in words is "one billion, two hundred seventy-three million, sixty-five thousand, two hundred twenty-one".