221011121021111 has 48 divisors (see below), whose sum is σ = 248749840435200. Its totient is φ = 195609874320000.

The previous prime is 221011121021063. The next prime is 221011121021153. The reversal of 221011121021111 is 111120121110122.

It is not a de Polignac number, because 221011121021111 - 2²² = 221011116826807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221011121021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011121621111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3982082861 + ... + 3982138361.

It is an arithmetic number, because the mean of its divisors is an integer number (5182288342400).

Almost surely, 2^{221011121021111} is an apocalyptic number.

221011121021111 is a deficient number, since it is larger than the sum of its proper divisors (27738719414089).

221011121021111 is a wasteful number, since it uses less digits than its factorization.

221011121021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63648 (or 63619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 221011121021111 its reverse (111120121110122), we get a palindrome (332131242131233).

The spelling of 221011121021111 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".