1321231122143 has 4 divisors (see below), whose sum is σ = 1366790816040. Its totient is φ = 1275671428248.

The previous prime is 1321231122067. The next prime is 1321231122163. The reversal of 1321231122143 is 3412211321231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321231122143 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 (1321231122163) 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, 22779846905 + ... + 22779846962.

It is an arithmetic number, because the mean of its divisors is an integer number (341697704010).

Almost surely, 2^{1321231122143} is an apocalyptic number.

1321231122143 is a deficient number, since it is larger than the sum of its proper divisors (45559693897).

1321231122143 is an equidigital number, since it uses as much as digits as its factorization.

1321231122143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45559693896.

The product of its digits is 1728, while the sum is 26.

Adding to 1321231122143 its reverse (3412211321231), we get a palindrome (4733442443374).

The spelling of 1321231122143 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred forty-three".