12012231331221 has 128 divisors (see below), whose sum is σ = 19188978278400. Its totient is φ = 6656438835200.

The previous prime is 12012231331207. The next prime is 12012231331223. The reversal of 12012231331221 is 12213313221021.

It is not a de Polignac number, because 12012231331221 - 2¹⁷ = 12012231200149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012231331191 and 12012231331200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012231331223) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 665156890 + ... + 665174948.

It is an arithmetic number, because the mean of its divisors is an integer number (149913892800).

Almost surely, 2^{12012231331221} is an apocalyptic number.

12012231331221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012231331221 is a deficient number, since it is larger than the sum of its proper divisors (7176746947179).

12012231331221 is a wasteful number, since it uses less digits than its factorization.

12012231331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18392 (or 18370 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 12012231331221 its reverse (12213313221021), we get a palindrome (24225544552242).

The spelling of 12012231331221 in words is "twelve trillion, twelve billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-one".