12031121021321 has 16 divisors (see below), whose sum is σ = 12967395517440. Its totient is φ = 11128269453840.

The previous prime is 12031121021287. The next prime is 12031121021341. The reversal of 12031121021321 is 12312012113021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12031121021321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031121021293 and 12031121021302.

It is not an unprimeable number, because it can be changed into a prime (12031121021341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43154975 + ... + 43432868.

It is an arithmetic number, because the mean of its divisors is an integer number (810462219840).

Almost surely, 2^{12031121021321} is an apocalyptic number.

It is an amenable number.

12031121021321 is a deficient number, since it is larger than the sum of its proper divisors (936274496119).

12031121021321 is a wasteful number, since it uses less digits than its factorization.

12031121021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86588036.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12031121021321 its reverse (12312012113021), we get a palindrome (24343133134342).

The spelling of 12031121021321 in words is "twelve trillion, thirty-one billion, one hundred twenty-one million, twenty-one thousand, three hundred twenty-one".