1231121312321 has 8 divisors (see below), whose sum is σ = 1265605029024. Its totient is φ = 1196849803680.

The previous prime is 1231121312293. The next prime is 1231121312341. The reversal of 1231121312321 is 1232131211321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231121312321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231121312341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53040251 + ... + 53063456.

It is an arithmetic number, because the mean of its divisors is an integer number (158200628628).

Almost surely, 2^{1231121312321} is an apocalyptic number.

It is an amenable number.

1231121312321 is a deficient number, since it is larger than the sum of its proper divisors (34483716703).

1231121312321 is a wasteful number, since it uses less digits than its factorization.

1231121312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106104031.

The product of its digits is 432, while the sum is 23.

Adding to 1231121312321 its reverse (1232131211321), we get a palindrome (2463252523642).

The spelling of 1231121312321 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, three hundred twelve thousand, three hundred twenty-one".