12012012221 has 8 divisors (see below), whose sum is σ = 13111941504. Its totient is φ = 10913404320.

The previous prime is 12012012217. The next prime is 12012012227. The reversal of 12012012221 is 12221021021.

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 12012012221 - 2² = 12012012217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012012196 and 12012012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012012227) 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, 311285 + ... + 347738.

It is an arithmetic number, because the mean of its divisors is an integer number (1638992688).

Almost surely, 2^12012012221 is an apocalyptic number.

12012012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012012221 is a deficient number, since it is larger than the sum of its proper divisors (1099929283).

12012012221 is a wasteful number, since it uses less digits than its factorization.

12012012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660691.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12012012221 its reverse (12221021021), we get a palindrome (24233033242).

The spelling of 12012012221 in words is "twelve billion, twelve million, twelve thousand, two hundred twenty-one".