221111012111 has 16 divisors (see below), whose sum is σ = 249613898400. Its totient is φ = 194013120000.

The previous prime is 221111012081. The next prime is 221111012113. The reversal of 221111012111 is 111210111122.

It is a cyclic number.

It is not a de Polignac number, because 221111012111 - 2¹⁴ = 221110995727 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 (221111012113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841835 + ... + 1072803.

It is an arithmetic number, because the mean of its divisors is an integer number (15600868650).

Almost surely, 2^221111012111 is an apocalyptic number.

221111012111 is a deficient number, since it is larger than the sum of its proper divisors (28502886289).

221111012111 is a wasteful number, since it uses less digits than its factorization.

221111012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234010.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 221111012111 its reverse (111210111122), we get a palindrome (332321123233).

The spelling of 221111012111 in words is "two hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred eleven".