1201231123321 has 16 divisors (see below), whose sum is σ = 1302983010000. Its totient is φ = 1102936760320.

The previous prime is 1201231123277. The next prime is 1201231123331. The reversal of 1201231123321 is 1233211321021.

It can be written as a sum of positive squares in 8 ways, for example, as 148013325625 + 1053217797696 = 384725^2 + 1026264^2 .

It is not a de Polignac number, because 1201231123321 - 2⁷ = 1201231123193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201231123292 and 1201231123301.

It is not an unprimeable number, because it can be changed into a prime (1201231123331) 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, 18262725 + ... + 18328381.

It is an arithmetic number, because the mean of its divisors is an integer number (81436438125).

Almost surely, 2^{1201231123321} is an apocalyptic number.

It is an amenable number.

1201231123321 is a deficient number, since it is larger than the sum of its proper divisors (101751886679).

1201231123321 is a wasteful number, since it uses less digits than its factorization.

1201231123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91964.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1201231123321 its reverse (1233211321021), we get a palindrome (2434442444342).

The spelling of 1201231123321 in words is "one trillion, two hundred one billion, two hundred thirty-one million, one hundred twenty-three thousand, three hundred twenty-one".