211112221 has 8 divisors (see below), whose sum is σ = 212802464. Its totient is φ = 209427120.

The previous prime is 211112219. The next prime is 211112267. The reversal of 211112221 is 122211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211112221 - 2¹ = 211112219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131395 + ... + 132991.

It is an arithmetic number, because the mean of its divisors is an integer number (26600308).

Almost surely, 2^211112221 is an apocalyptic number.

It is an amenable number.

211112221 is a deficient number, since it is larger than the sum of its proper divisors (1690243).

211112221 is a wasteful number, since it uses less digits than its factorization.

211112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571.

The product of its digits is 16, while the sum is 13.

The square root of 211112221 is about 14529.7013389815. The cubic root of 211112221 is about 595.4397060477.

Adding to 211112221 its reverse (122211112), we get a palindrome (333323333).

It can be divided in two parts, 21111 and 2221, that added together give a palindrome (23332).

The spelling of 211112221 in words is "two hundred eleven million, one hundred twelve thousand, two hundred twenty-one".