12221201212111 has 4 divisors (see below), whose sum is σ = 12505415193832. Its totient is φ = 11936987230392.

The previous prime is 12221201212091. The next prime is 12221201212117. The reversal of 12221201212111 is 11121210212221.

It is a happy number.

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 12221201212111 - 2⁹ = 12221201211599 is a prime.

It is a super-2 number, since 2×12221201212111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221201212117) 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, 142106990796 + ... + 142106990881.

It is an arithmetic number, because the mean of its divisors is an integer number (3126353798458).

Almost surely, 2^{12221201212111} is an apocalyptic number.

12221201212111 is a deficient number, since it is larger than the sum of its proper divisors (284213981721).

12221201212111 is an equidigital number, since it uses as much as digits as its factorization.

12221201212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284213981720.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12221201212111 its reverse (11121210212221), we get a palindrome (23342411424332).

The spelling of 12221201212111 in words is "twelve trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one hundred eleven".