123123011030221 has 4 divisors (see below), whose sum is σ = 123834704735772. Its totient is φ = 122411317324672.

The previous prime is 123123011030153. The next prime is 123123011030293. The reversal of 123123011030221 is 122030110321321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58748223938121 + 64374787092100 = 7664739^2 + 8023390^2 .

It is a cyclic number.

It is not a de Polignac number, because 123123011030221 - 2⁷ = 123123011030093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123123011030192 and 123123011030201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123011030521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355846852516 + ... + 355846852861.

It is an arithmetic number, because the mean of its divisors is an integer number (30958676183943).

Almost surely, 2^{123123011030221} is an apocalyptic number.

It is an amenable number.

123123011030221 is a deficient number, since it is larger than the sum of its proper divisors (711693705551).

123123011030221 is an equidigital number, since it uses as much as digits as its factorization.

123123011030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711693705550.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 123123011030221 its reverse (122030110321321), we get a palindrome (245153121351542).

The spelling of 123123011030221 in words is "one hundred twenty-three trillion, one hundred twenty-three billion, eleven million, thirty thousand, two hundred twenty-one".