221123321111 has 72 divisors (see below), whose sum is σ = 304438922496. Its totient is φ = 158712718080.

The previous prime is 221123321101. The next prime is 221123321119. The reversal of 221123321111 is 111123321122.

It is a de Polignac number, because none of the positive numbers 2^k-221123321111 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 (221123321119) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7306136 + ... + 7336338.

It is an arithmetic number, because the mean of its divisors is an integer number (4228318368).

Almost surely, 2^221123321111 is an apocalyptic number.

221123321111 is a deficient number, since it is larger than the sum of its proper divisors (83315601385).

221123321111 is a wasteful number, since it uses less digits than its factorization.

221123321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30309 (or 30285 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 221123321111 its reverse (111123321122), we get a palindrome (332246642233).

The spelling of 221123321111 in words is "two hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-one thousand, one hundred eleven".