1231201121443 has 16 divisors (see below), whose sum is σ = 1360812220416. Its totient is φ = 1107981832320.

The previous prime is 1231201121429. The next prime is 1231201121453. The reversal of 1231201121443 is 3441211021321.

It is a cyclic number.

It is not a de Polignac number, because 1231201121443 - 2⁵ = 1231201121411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231201121453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462238 + ... + 1635868.

It is an arithmetic number, because the mean of its divisors is an integer number (85050763776).

Almost surely, 2^{1231201121443} is an apocalyptic number.

1231201121443 is a deficient number, since it is larger than the sum of its proper divisors (129611098973).

1231201121443 is a wasteful number, since it uses less digits than its factorization.

1231201121443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176354.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 1231201121443 its reverse (3441211021321), we get a palindrome (4672412142764).

The spelling of 1231201121443 in words is "one trillion, two hundred thirty-one billion, two hundred one million, one hundred twenty-one thousand, four hundred forty-three".