221111101011 has 16 divisors (see below), whose sum is σ = 318718707200. Its totient is φ = 135874814688.

The previous prime is 221111101007. The next prime is 221111101037. The reversal of 221111101011 is 110101111122.

It is not a de Polignac number, because 221111101011 - 2² = 221111101007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111101061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52418731 + ... + 52422948.

It is an arithmetic number, because the mean of its divisors is an integer number (19919919200).

Almost surely, 2^221111101011 is an apocalyptic number.

221111101011 is a deficient number, since it is larger than the sum of its proper divisors (97607606189).

221111101011 is a wasteful number, since it uses less digits than its factorization.

221111101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104841738.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 221111101011 its reverse (110101111122), we get a palindrome (331212212133).

The spelling of 221111101011 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred one thousand, eleven".