221200011111 has 4 divisors (see below), whose sum is σ = 294933348152. Its totient is φ = 147466674072.

The previous prime is 221200011089. The next prime is 221200011127. The reversal of 221200011111 is 111110002122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221200011111 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 (221200011611) 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, 36866668516 + ... + 36866668521.

It is an arithmetic number, because the mean of its divisors is an integer number (73733337038).

Almost surely, 2^221200011111 is an apocalyptic number.

221200011111 is a deficient number, since it is larger than the sum of its proper divisors (73733337041).

221200011111 is an equidigital number, since it uses as much as digits as its factorization.

221200011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73733337040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221200011111 its reverse (111110002122), we get a palindrome (332310013233).

The spelling of 221200011111 in words is "two hundred twenty-one billion, two hundred million, eleven thousand, one hundred eleven".