1321217069 has 2 divisors, whose sum is σ = 1321217070. Its totient is φ = 1321217068.

The previous prime is 1321217059. The next prime is 1321217077. The reversal of 1321217069 is 9607121231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758341444 + 562875625 = 27538^2 + 23725^2 .

It is an emirp because it is prime and its reverse (9607121231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321217069 - 2²⁴ = 1304439853 is a prime.

It is a super-2 number, since 2×1321217069² = 3491229086833901522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321217059) 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, 660608534 + 660608535.

It is an arithmetic number, because the mean of its divisors is an integer number (660608535).

Almost surely, 2^1321217069 is an apocalyptic number.

It is an amenable number.

1321217069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321217069 is an equidigital number, since it uses as much as digits as its factorization.

1321217069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1321217069 is about 36348.5497509873. The cubic root of 1321217069 is about 1097.2983477319.

The spelling of 1321217069 in words is "one billion, three hundred twenty-one million, two hundred seventeen thousand, sixty-nine".