12212011221 has 8 divisors (see below), whose sum is σ = 16290917280. Its totient is φ = 8137222992.

The previous prime is 12212011177. The next prime is 12212011241. The reversal of 12212011221 is 12211021221.

12212011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12212011221 - 2⁹ = 12212010709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12212011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212011241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022530 + ... + 1034403.

It is an arithmetic number, because the mean of its divisors is an integer number (2036364660).

Almost surely, 2^12212011221 is an apocalyptic number.

It is an amenable number.

12212011221 is a deficient number, since it is larger than the sum of its proper divisors (4078906059).

12212011221 is a wasteful number, since it uses less digits than its factorization.

12212011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058915.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12212011221 its reverse (12211021221), we get a palindrome (24423032442).

The spelling of 12212011221 in words is "twelve billion, two hundred twelve million, eleven thousand, two hundred twenty-one".