1321242340143 has 12 divisors (see below), whose sum is σ = 1936366184984. Its totient is φ = 800752933200.

The previous prime is 1321242340139. The next prime is 1321242340247. The reversal of 1321242340143 is 3410432421231.

It is not a de Polignac number, because 1321242340143 - 2² = 1321242340139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321242340143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321242340043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1819892668 + ... + 1819893393.

Almost surely, 2^{1321242340143} is an apocalyptic number.

1321242340143 is a deficient number, since it is larger than the sum of its proper divisors (615123844841).

1321242340143 is a wasteful number, since it uses less digits than its factorization.

1321242340143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639786086 (or 3639786075 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1321242340143 its reverse (3410432421231), we get a palindrome (4731674761374).

The spelling of 1321242340143 in words is "one trillion, three hundred twenty-one billion, two hundred forty-two million, three hundred forty thousand, one hundred forty-three".