12212120021111 has 4 divisors (see below), whose sum is σ = 12227637328152. Its totient is φ = 12196602714072.

The previous prime is 12212120021107. The next prime is 12212120021177. The reversal of 12212120021111 is 11112002121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12212120021111 - 2² = 12212120021107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12212120021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212120021191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7758652340 + ... + 7758653913.

It is an arithmetic number, because the mean of its divisors is an integer number (3056909332038).

Almost surely, 2^{12212120021111} is an apocalyptic number.

12212120021111 is a deficient number, since it is larger than the sum of its proper divisors (15517307041).

12212120021111 is an equidigital number, since it uses as much as digits as its factorization.

12212120021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15517307040.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12212120021111 its reverse (11112002121221), we get a palindrome (23324122142332).

The spelling of 12212120021111 in words is "twelve trillion, two hundred twelve billion, one hundred twenty million, twenty-one thousand, one hundred eleven".