221022111111 has 16 divisors (see below), whose sum is σ = 295017228000. Its totient is φ = 147187611648.

The previous prime is 221022111073. The next prime is 221022111119. The reversal of 221022111111 is 111111220122.

It is a happy number.

It is not a de Polignac number, because 221022111111 - 2⁶ = 221022111047 is a prime.

It is a super-3 number, since 3×221022111111³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022111119) 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, 15747645 + ... + 15761673.

It is an arithmetic number, because the mean of its divisors is an integer number (18438576750).

Almost surely, 2^221022111111 is an apocalyptic number.

221022111111 is a deficient number, since it is larger than the sum of its proper divisors (73995116889).

221022111111 is a wasteful number, since it uses less digits than its factorization.

221022111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19378.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221022111111 its reverse (111111220122), we get a palindrome (332133331233).

The spelling of 221022111111 in words is "two hundred twenty-one billion, twenty-two million, one hundred eleven thousand, one hundred eleven".