12391120001221 has 8 divisors (see below), whose sum is σ = 13344386436864. Its totient is φ = 11437868331120.

The previous prime is 12391120001137. The next prime is 12391120001233. The reversal of 12391120001221 is 12210002119321.

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

It is a cyclic number.

It is not a de Polignac number, because 12391120001221 - 2¹⁷ = 12391119870149 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 (12391120001261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1916845 + ... + 5334466.

It is an arithmetic number, because the mean of its divisors is an integer number (1668048304608).

Almost surely, 2^{12391120001221} is an apocalyptic number.

It is an amenable number.

12391120001221 is a deficient number, since it is larger than the sum of its proper divisors (953266435643).

12391120001221 is a wasteful number, since it uses less digits than its factorization.

12391120001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382771.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 12391120001221 in words is "twelve trillion, three hundred ninety-one billion, one hundred twenty million, one thousand, two hundred twenty-one".