1321120043 has 2 divisors, whose sum is σ = 1321120044. Its totient is φ = 1321120042.

The previous prime is 1321120013. The next prime is 1321120049. The reversal of 1321120043 is 3400211231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321120043 - 2⁶ = 1321119979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321120049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660560021 + 660560022.

It is an arithmetic number, because the mean of its divisors is an integer number (660560022).

Almost surely, 2^1321120043 is an apocalyptic number.

1321120043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321120043 is an equidigital number, since it uses as much as digits as its factorization.

1321120043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1321120043 is about 36347.2150652564. The cubic root of 1321120043 is about 1097.2714863684.

Adding to 1321120043 its reverse (3400211231), we get a palindrome (4721331274).

The spelling of 1321120043 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, forty-three".