1320421543 has 8 divisors (see below), whose sum is σ = 1509372288. Its totient is φ = 1131550584.

The previous prime is 1320421541. The next prime is 1320421547. The reversal of 1320421543 is 3451240231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320421543 - 2¹ = 1320421541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320421541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21180 + ... + 55582.

It is an arithmetic number, because the mean of its divisors is an integer number (188671536).

Almost surely, 2^1320421543 is an apocalyptic number.

1320421543 is a deficient number, since it is larger than the sum of its proper divisors (188950745).

1320421543 is an equidigital number, since it uses as much as digits as its factorization.

1320421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39893.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1320421543 is about 36337.6050806874. The cubic root of 1320421543 is about 1097.0780698669.

Adding to 1320421543 its reverse (3451240231), we get a palindrome (4771661774).

The spelling of 1320421543 in words is "one billion, three hundred twenty million, four hundred twenty-one thousand, five hundred forty-three".