1231123320101 has 4 divisors (see below), whose sum is σ = 1231129785600. Its totient is φ = 1231116854604.

The previous prime is 1231123320083. The next prime is 1231123320113. The reversal of 1231123320101 is 1010233211321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231123320101 - 2¹⁴ = 1231123303717 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 (1231123320151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2938181 + ... + 3330938.

It is an arithmetic number, because the mean of its divisors is an integer number (307782446400).

Almost surely, 2^{1231123320101} is an apocalyptic number.

It is an amenable number.

1231123320101 is a deficient number, since it is larger than the sum of its proper divisors (6465499).

1231123320101 is an equidigital number, since it uses as much as digits as its factorization.

1231123320101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465498.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1231123320101 its reverse (1010233211321), we get a palindrome (2241356531422).

The spelling of 1231123320101 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, three hundred twenty thousand, one hundred one".