221222110001111 has 32 divisors (see below), whose sum is σ = 235734842142720. Its totient is φ = 206880069989376.

The previous prime is 221222110001093. The next prime is 221222110001131. The reversal of 221222110001111 is 111100011222122.

It is a de Polignac number, because none of the positive numbers 2^k-221222110001111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 221222110001111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222110001131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3997552880 + ... + 3997608218.

It is an arithmetic number, because the mean of its divisors is an integer number (7366713816960).

Almost surely, 2^{221222110001111} is an apocalyptic number.

221222110001111 is a deficient number, since it is larger than the sum of its proper divisors (14512732141609).

221222110001111 is a wasteful number, since it uses less digits than its factorization.

221222110001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57623.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221222110001111 its reverse (111100011222122), we get a palindrome (332322121223233).

The spelling of 221222110001111 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one thousand, one hundred eleven".