12221220111 has 4 divisors (see below), whose sum is σ = 16294960152. Its totient is φ = 8147480072.

The previous prime is 12221220101. The next prime is 12221220113. The reversal of 12221220111 is 11102212221.

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 12221220111 - 2⁹ = 12221219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221220113) 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, 2036870016 + ... + 2036870021.

It is an arithmetic number, because the mean of its divisors is an integer number (4073740038).

Almost surely, 2^12221220111 is an apocalyptic number.

12221220111 is a deficient number, since it is larger than the sum of its proper divisors (4073740041).

12221220111 is an equidigital number, since it uses as much as digits as its factorization.

12221220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073740040.

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

Adding to 12221220111 its reverse (11102212221), we get a palindrome (23323432332).

The spelling of 12221220111 in words is "twelve billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".