221331323123 has 4 divisors (see below), whose sum is σ = 222113412888. Its totient is φ = 220549233360.

The previous prime is 221331323117. The next prime is 221331323137. The reversal of 221331323123 is 321323133122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321323133122 = 2 ⋅160661566561.

It is a cyclic number.

It is not a de Polignac number, because 221331323123 - 2²⁰ = 221330274547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221331323092 and 221331323101.

It is not an unprimeable number, because it can be changed into a prime (221331323623) 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 3 ways as a sum of consecutive naturals, for example, 391044458 + ... + 391045023.

It is an arithmetic number, because the mean of its divisors is an integer number (55528353222).

Almost surely, 2^221331323123 is an apocalyptic number.

221331323123 is a deficient number, since it is larger than the sum of its proper divisors (782089765).

221331323123 is an equidigital number, since it uses as much as digits as its factorization.

221331323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782089764.

The product of its digits is 3888, while the sum is 26.

Adding to 221331323123 its reverse (321323133122), we get a palindrome (542654456245).

The spelling of 221331323123 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred twenty-three".