1312421443 has 4 divisors (see below), whose sum is σ = 1313908648. Its totient is φ = 1310934240.

The previous prime is 1312421431. The next prime is 1312421489. The reversal of 1312421443 is 3441242131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3441242131 = 97 ⋅35476723.

It is a cyclic number.

It is not a de Polignac number, because 1312421443 - 2²¹ = 1310324291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312427443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742278 + ... + 744043.

It is an arithmetic number, because the mean of its divisors is an integer number (328477162).

Almost surely, 2^1312421443 is an apocalyptic number.

1312421443 is a deficient number, since it is larger than the sum of its proper divisors (1487205).

1312421443 is an equidigital number, since it uses as much as digits as its factorization.

1312421443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487204.

The product of its digits is 2304, while the sum is 25.

The square root of 1312421443 is about 36227.3576596472. The cubic root of 1312421443 is about 1094.8579406069.

Adding to 1312421443 its reverse (3441242131), we get a palindrome (4753663574).

The spelling of 1312421443 in words is "one billion, three hundred twelve million, four hundred twenty-one thousand, four hundred forty-three".