1320421043 has 4 divisors (see below), whose sum is σ = 1320693648. Its totient is φ = 1320148440.

The previous prime is 1320421033. The next prime is 1320421057. The reversal of 1320421043 is 3401240231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3401240231 = 49109 ⋅69259.

It is a cyclic number.

It is not a de Polignac number, because 1320421043 - 2¹² = 1320416947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320421013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128903 + ... + 138768.

It is an arithmetic number, because the mean of its divisors is an integer number (330173412).

Almost surely, 2^1320421043 is an apocalyptic number.

1320421043 is a deficient number, since it is larger than the sum of its proper divisors (272605).

1320421043 is an equidigital number, since it uses as much as digits as its factorization.

1320421043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272604.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1320421043 is about 36337.5982007617. The cubic root of 1320421043 is about 1097.0779313911.

Adding to 1320421043 its reverse (3401240231), we get a palindrome (4721661274).

The spelling of 1320421043 in words is "one billion, three hundred twenty million, four hundred twenty-one thousand, forty-three".