221311113123 has 8 divisors (see below), whose sum is σ = 295085152336. Its totient is φ = 147538908000.

The previous prime is 221311113109. The next prime is 221311113151. The reversal of 221311113123 is 321311113122.

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

It is not a de Polignac number, because 221311113123 - 2²⁹ = 220774242211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221311113123.

It is not an unprimeable number, because it can be changed into a prime (221311113103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146668 + ... + 681273.

It is an arithmetic number, because the mean of its divisors is an integer number (36885644042).

Almost surely, 2^221311113123 is an apocalyptic number.

221311113123 is a deficient number, since it is larger than the sum of its proper divisors (73774039213).

221311113123 is an equidigital number, since it uses as much as digits as its factorization.

221311113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917045.

The product of its digits is 216, while the sum is 21.

Adding to 221311113123 its reverse (321311113122), we get a palindrome (542622226245).

Subtracting 221311113123 from its reverse (321311113122), we obtain a palindrome (99999999999).

The spelling of 221311113123 in words is "two hundred twenty-one billion, three hundred eleven million, one hundred thirteen thousand, one hundred twenty-three".