1221332263 has 2 divisors, whose sum is σ = 1221332264. Its totient is φ = 1221332262.

The previous prime is 1221332261. The next prime is 1221332339. The reversal of 1221332263 is 3622331221.

It is a weak prime.

It is an emirp because it is prime and its reverse (3622331221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221332263 - 2¹ = 1221332261 is a prime.

Together with 1221332261, 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 (1221332261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610666131 + 610666132.

It is an arithmetic number, because the mean of its divisors is an integer number (610666132).

Almost surely, 2^1221332263 is an apocalyptic number.

1221332263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221332263 is an equidigital number, since it uses as much as digits as its factorization.

1221332263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

The square root of 1221332263 is about 34947.5644788017. The cubic root of 1221332263 is about 1068.9185401905.

Adding to 1221332263 its reverse (3622331221), we get a palindrome (4843663484).

The spelling of 1221332263 in words is "one billion, two hundred twenty-one million, three hundred thirty-two thousand, two hundred sixty-three".