221010111220111 has 4 divisors (see below), whose sum is σ = 221038384236912. Its totient is φ = 220981838203312.

The previous prime is 221010111220081. The next prime is 221010111220133. The reversal of 221010111220111 is 111022111010122.

221010111220111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010111220111 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 (221010114220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14136496675 + ... + 14136512308.

It is an arithmetic number, because the mean of its divisors is an integer number (55259596059228).

Almost surely, 2^{221010111220111} is an apocalyptic number.

221010111220111 is a deficient number, since it is larger than the sum of its proper divisors (28273016801).

221010111220111 is an equidigital number, since it uses as much as digits as its factorization.

221010111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28273016800.

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

Adding to 221010111220111 its reverse (111022111010122), we get a palindrome (332032222230233).

The spelling of 221010111220111 in words is "two hundred twenty-one trillion, ten billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".