1221320293 has 2 divisors, whose sum is σ = 1221320294. Its totient is φ = 1221320292.

The previous prime is 1221320291. The next prime is 1221320371. The reversal of 1221320293 is 3920231221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733705569 + 487614724 = 27087^2 + 22082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221320293 - 2¹ = 1221320291 is a prime.

Together with 1221320291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221320291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610660146 + 610660147.

It is an arithmetic number, because the mean of its divisors is an integer number (610660147).

Almost surely, 2^1221320293 is an apocalyptic number.

It is an amenable number.

1221320293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221320293 is an equidigital number, since it uses as much as digits as its factorization.

1221320293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1221320293 is about 34947.3932218127. The cubic root of 1221320293 is about 1068.9150481032.

The spelling of 1221320293 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred ninety-three".