123313320021 has 16 divisors (see below), whose sum is σ = 174684297600. Its totient is φ = 77228843328.

The previous prime is 123313319929. The next prime is 123313320059. The reversal of 123313320021 is 120023313321.

It is not a de Polignac number, because 123313320021 - 2¹¹ = 123313317973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123313320021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123313320071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19150761 + ... + 19157198.

It is an arithmetic number, because the mean of its divisors is an integer number (10917768600).

Almost surely, 2^123313320021 is an apocalyptic number.

It is an amenable number.

123313320021 is a deficient number, since it is larger than the sum of its proper divisors (51370977579).

123313320021 is a wasteful number, since it uses less digits than its factorization.

123313320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38308028.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 123313320021 its reverse (120023313321), we get a palindrome (243336633342).

The spelling of 123313320021 in words is "one hundred twenty-three billion, three hundred thirteen million, three hundred twenty thousand, twenty-one".