2111211112221 has 12 divisors (see below), whose sum is σ = 3049982198848. Its totient is φ = 1407264057864.

The previous prime is 2111211112183. The next prime is 2111211112279. The reversal of 2111211112221 is 1222111121112.

It is a happy number.

2111211112221 is a `hidden beast` number, since 211 + 121 + 1 + 112 + 221 = 666.

It is not a de Polignac number, because 2111211112221 - 2⁷ = 2111211112093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111211112194 and 2111211112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111211112121) 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, 17437735 + ... + 17558388.

Almost surely, 2^{2111211112221} is an apocalyptic number.

It is an amenable number.

2111211112221 is a deficient number, since it is larger than the sum of its proper divisors (938771086627).

2111211112221 is a wasteful number, since it uses less digits than its factorization.

2111211112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35002832 (or 35002829 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2111211112221 its reverse (1222111121112), we get a palindrome (3333322233333).

The spelling of 2111211112221 in words is "two trillion, one hundred eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty-one".