123320111021 has 4 divisors (see below), whose sum is σ = 129810643200. Its totient is φ = 116829578844.

The previous prime is 123320110987. The next prime is 123320111023. The reversal of 123320111021 is 120111023321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123320111021 - 2¹⁴ = 123320094637 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 (123320111023) 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, 3245266061 + ... + 3245266098.

It is an arithmetic number, because the mean of its divisors is an integer number (32452660800).

Almost surely, 2^123320111021 is an apocalyptic number.

It is an amenable number.

123320111021 is a deficient number, since it is larger than the sum of its proper divisors (6490532179).

123320111021 is an equidigital number, since it uses as much as digits as its factorization.

123320111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490532178.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123320111021 its reverse (120111023321), we get a palindrome (243431134342).

The spelling of 123320111021 in words is "one hundred twenty-three billion, three hundred twenty million, one hundred eleven thousand, twenty-one".