1224881321 has 2 divisors, whose sum is σ = 1224881322. Its totient is φ = 1224881320.

The previous prime is 1224881311. The next prime is 1224881327. The reversal of 1224881321 is 1231884221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219755625 + 5125696 = 34925^2 + 2264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224881321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1224881327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612440660 + 612440661.

It is an arithmetic number, because the mean of its divisors is an integer number (612440661).

Almost surely, 2^1224881321 is an apocalyptic number.

It is an amenable number.

1224881321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224881321 is an equidigital number, since it uses as much as digits as its factorization.

1224881321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 1224881321 is about 34998.3045446490. The cubic root of 1224881321 is about 1069.9529256956.

The spelling of 1224881321 in words is "one billion, two hundred twenty-four million, eight hundred eighty-one thousand, three hundred twenty-one".