221011211111 has 8 divisors (see below), whose sum is σ = 222150445920. Its totient is φ = 219873490848.

The previous prime is 221011211053. The next prime is 221011211119. The reversal of 221011211111 is 111112110122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221011211111 - 2¹⁰ = 221011210087 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 (221011211119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85451 + ... + 670316.

It is an arithmetic number, because the mean of its divisors is an integer number (27768805740).

Almost surely, 2^221011211111 is an apocalyptic number.

221011211111 is a deficient number, since it is larger than the sum of its proper divisors (1139234809).

221011211111 is a wasteful number, since it uses less digits than its factorization.

221011211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757273.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 221011211111 its reverse (111112110122), we get a palindrome (332123321233).

The spelling of 221011211111 in words is "two hundred twenty-one billion, eleven million, two hundred eleven thousand, one hundred eleven".