12031130021221 has 4 divisors (see below), whose sum is σ = 12117684913600. Its totient is φ = 11944575128844.

The previous prime is 12031130021153. The next prime is 12031130021293. The reversal of 12031130021221 is 12212003113021.

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 12031130021221 - 2²¹ = 12031127924069 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 (12031130021921) 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, 43277445981 + ... + 43277446258.

It is an arithmetic number, because the mean of its divisors is an integer number (3029421228400).

Almost surely, 2^{12031130021221} is an apocalyptic number.

It is an amenable number.

12031130021221 is a deficient number, since it is larger than the sum of its proper divisors (86554892379).

12031130021221 is an equidigital number, since it uses as much as digits as its factorization.

12031130021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86554892378.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 12031130021221 its reverse (12212003113021), we get a palindrome (24243133134242).

The spelling of 12031130021221 in words is "twelve trillion, thirty-one billion, one hundred thirty million, twenty-one thousand, two hundred twenty-one".