123021112013 has 4 divisors (see below), whose sum is σ = 123025470780. Its totient is φ = 123016753248.

The previous prime is 123021112009. The next prime is 123021112061. The reversal of 123021112013 is 310211120321.

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 100719273769 + 22301838244 = 317363^2 + 149338^2 .

It is a cyclic number.

It is not a de Polignac number, because 123021112013 - 2² = 123021112009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123021111982 and 123021112000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123021112063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136770 + ... + 2193587.

It is an arithmetic number, because the mean of its divisors is an integer number (30756367695).

Almost surely, 2^123021112013 is an apocalyptic number.

It is an amenable number.

123021112013 is a deficient number, since it is larger than the sum of its proper divisors (4358767).

123021112013 is an equidigital number, since it uses as much as digits as its factorization.

123021112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358766.

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

Adding to 123021112013 its reverse (310211120321), we get a palindrome (433232232334).

The spelling of 123021112013 in words is "one hundred twenty-three billion, twenty-one million, one hundred twelve thousand, thirteen".