12221112212111 has 16 divisors (see below), whose sum is σ = 13553290192896. Its totient is φ = 10927252500000.

The previous prime is 12221112212081. The next prime is 12221112212117. The reversal of 12221112212111 is 11121221112221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12221112212111 - 2¹⁸ = 12221111949967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221112212117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36256415 + ... + 36591936.

It is an arithmetic number, because the mean of its divisors is an integer number (847080637056).

Almost surely, 2^{12221112212111} is an apocalyptic number.

12221112212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12221112212111 is a deficient number, since it is larger than the sum of its proper divisors (1332177980785).

12221112212111 is a wasteful number, since it uses less digits than its factorization.

12221112212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72848614.

The product of its digits is 64, while the sum is 20.

Adding to 12221112212111 its reverse (11121221112221), we get a palindrome (23342333324332).

The spelling of 12221112212111 in words is "twelve trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred eleven".