12011231221 has 8 divisors (see below), whose sum is σ = 13873935744. Its totient is φ = 10276989120.

The previous prime is 12011231203. The next prime is 12011231231. The reversal of 12011231221 is 12213211021.

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 12011231221 - 2¹⁷ = 12011100149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011231195 and 12011231204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011231231) 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 7 ways as a sum of consecutive naturals, for example, 32115405 + ... + 32115778.

It is an arithmetic number, because the mean of its divisors is an integer number (1734241968).

Almost surely, 2^12011231221 is an apocalyptic number.

12011231221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011231221 is a deficient number, since it is larger than the sum of its proper divisors (1862704523).

12011231221 is a wasteful number, since it uses less digits than its factorization.

12011231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64231211.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12011231221 its reverse (12213211021), we get a palindrome (24224442242).

The spelling of 12011231221 in words is "twelve billion, eleven million, two hundred thirty-one thousand, two hundred twenty-one".