12012122221 has 16 divisors (see below), whose sum is σ = 13799338560. Its totient is φ = 10341233280.

The previous prime is 12012122201. The next prime is 12012122251. The reversal of 12012122221 is 12222121021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12012122221 - 2¹⁹ = 12011597933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012122195 and 12012122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012122201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587055 + ... + 607171.

It is an arithmetic number, because the mean of its divisors is an integer number (862458660).

Almost surely, 2^12012122221 is an apocalyptic number.

12012122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012122221 is a deficient number, since it is larger than the sum of its proper divisors (1787216339).

12012122221 is a wasteful number, since it uses less digits than its factorization.

12012122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23004.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12012122221 its reverse (12222121021), we get a palindrome (24234243242).

The spelling of 12012122221 in words is "twelve billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".