1231123001321 has 4 divisors (see below), whose sum is σ = 1242017895252. Its totient is φ = 1220228107392.

The previous prime is 1231123001287. The next prime is 1231123001399. The reversal of 1231123001321 is 1231003211321.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 259626935296 + 971496066025 = 509536^2 + 985645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231123001321 - 2¹⁰ = 1231123000297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231123001293 and 1231123001302.

It is not an unprimeable number, because it can be changed into a prime (1231123001221) 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, 5447446796 + ... + 5447447021.

It is an arithmetic number, because the mean of its divisors is an integer number (310504473813).

Almost surely, 2^{1231123001321} is an apocalyptic number.

It is an amenable number.

1231123001321 is a deficient number, since it is larger than the sum of its proper divisors (10894893931).

1231123001321 is a wasteful number, since it uses less digits than its factorization.

1231123001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10894893930.

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

Adding to 1231123001321 its reverse (1231003211321), we get a palindrome (2462126212642).

The spelling of 1231123001321 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, one thousand, three hundred twenty-one".