221100100111 has 4 divisors (see below), whose sum is σ = 241200109224. Its totient is φ = 201000091000.

The previous prime is 221100100093. The next prime is 221100100121. The reversal of 221100100111 is 111001001122.

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-221100100111 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 (221100100121) 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, 10050004540 + ... + 10050004561.

It is an arithmetic number, because the mean of its divisors is an integer number (60300027306).

Almost surely, 2^221100100111 is an apocalyptic number.

221100100111 is a deficient number, since it is larger than the sum of its proper divisors (20100009113).

221100100111 is a wasteful number, since it uses less digits than its factorization.

221100100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100009112.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221100100111 its reverse (111001001122), we get a palindrome (332101101233).

The spelling of 221100100111 in words is "two hundred twenty-one billion, one hundred million, one hundred thousand, one hundred eleven".