12012022221 has 8 divisors (see below), whose sum is σ = 16024615584. Its totient is φ = 8003721840.

The previous prime is 12012022219. The next prime is 12012022247. The reversal of 12012022221 is 12222021021.

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

It is not a de Polignac number, because 12012022221 - 2¹ = 12012022219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012022261) 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, 1066710 + ... + 1077911.

It is an arithmetic number, because the mean of its divisors is an integer number (2003076948).

Almost surely, 2^12012022221 is an apocalyptic number.

It is an amenable number.

12012022221 is a deficient number, since it is larger than the sum of its proper divisors (4012593363).

12012022221 is a wasteful number, since it uses less digits than its factorization.

12012022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146491.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12012022221 its reverse (12222021021), we get a palindrome (24234043242).

The spelling of 12012022221 in words is "twelve billion, twelve million, twenty-two thousand, two hundred twenty-one".