1321322243 has 2 divisors, whose sum is σ = 1321322244. Its totient is φ = 1321322242.

The previous prime is 1321322237. The next prime is 1321322251. The reversal of 1321322243 is 3422231231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321322243 - 2⁸ = 1321321987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321322543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660661121 + 660661122.

It is an arithmetic number, because the mean of its divisors is an integer number (660661122).

Almost surely, 2^1321322243 is an apocalyptic number.

1321322243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321322243 is an equidigital number, since it uses as much as digits as its factorization.

1321322243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 1321322243 is about 36349.9964649242. The cubic root of 1321322243 is about 1097.3274633599.

Adding to 1321322243 its reverse (3422231231), we get a palindrome (4743553474).

The spelling of 1321322243 in words is "one billion, three hundred twenty-one million, three hundred twenty-two thousand, two hundred forty-three".