12101222112221 has 12 divisors (see below), whose sum is σ = 14001414016800. Its totient is φ = 10422105166440.

The previous prime is 12101222112209. The next prime is 12101222112227. The reversal of 12101222112221 is 12221122210121.

It is not a de Polignac number, because 12101222112221 - 2⁶ = 12101222112157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12101222112193 and 12101222112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101222112227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2631842441 + ... + 2631847038.

It is an arithmetic number, because the mean of its divisors is an integer number (1166784501400).

Almost surely, 2^{12101222112221} is an apocalyptic number.

12101222112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12101222112221 is a deficient number, since it is larger than the sum of its proper divisors (1900191904579).

12101222112221 is a wasteful number, since it uses less digits than its factorization.

12101222112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263689520 (or 5263689509 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12101222112221 its reverse (12221122210121), we get a palindrome (24322344322342).

The spelling of 12101222112221 in words is "twelve trillion, one hundred one billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".