2212112112221 has 16 divisors (see below), whose sum is σ = 2437303307328. Its totient is φ = 1990939152000.

The previous prime is 2212112112209. The next prime is 2212112112227. The reversal of 2212112112221 is 1222112112122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2212112112221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2212112112193 and 2212112112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212112112227) 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, 14939270 + ... + 15086616.

It is an arithmetic number, because the mean of its divisors is an integer number (152331456708).

Almost surely, 2^{2212112112221} is an apocalyptic number.

It is an amenable number.

2212112112221 is a deficient number, since it is larger than the sum of its proper divisors (225191195107).

2212112112221 is a wasteful number, since it uses less digits than its factorization.

2212112112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160972.

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

Adding to 2212112112221 its reverse (1222112112122), we get a palindrome (3434224224343).

Subtracting from 2212112112221 its reverse (1222112112122), we obtain a palindrome (990000000099).

The spelling of 2212112112221 in words is "two trillion, two hundred twelve billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".