12101212221 has 16 divisors (see below), whose sum is σ = 19524645504. Its totient is φ = 6508214784.

The previous prime is 12101212219. The next prime is 12101212223. The reversal of 12101212221 is 12221210121.

12101212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12101212219) and next prime (12101212223).

It is not a de Polignac number, because 12101212221 - 2¹ = 12101212219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12101212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101212223) 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 15 ways as a sum of consecutive naturals, for example, 16948120 + ... + 16948833.

It is an arithmetic number, because the mean of its divisors is an integer number (1220290344).

Almost surely, 2^12101212221 is an apocalyptic number.

It is an amenable number.

12101212221 is a deficient number, since it is larger than the sum of its proper divisors (7423433283).

12101212221 is a wasteful number, since it uses less digits than its factorization.

12101212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33896980.

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

Adding to 12101212221 its reverse (12221210121), we get a palindrome (24322422342).

The spelling of 12101212221 in words is "twelve billion, one hundred one million, two hundred twelve thousand, two hundred twenty-one".