123030021013 has 4 divisors (see below), whose sum is σ = 123709745068. Its totient is φ = 122350296960.

The previous prime is 123030020989. The next prime is 123030021041. The reversal of 123030021013 is 310120030321.

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 36006201009 + 87023820004 = 189753^2 + 294998^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123030021013 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 (123030022013) 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, 339861756 + ... + 339862117.

It is an arithmetic number, because the mean of its divisors is an integer number (30927436267).

Almost surely, 2^123030021013 is an apocalyptic number.

It is an amenable number.

123030021013 is a deficient number, since it is larger than the sum of its proper divisors (679724055).

123030021013 is an equidigital number, since it uses as much as digits as its factorization.

123030021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679724054.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 123030021013 its reverse (310120030321), we get a palindrome (433150051334).

The spelling of 123030021013 in words is "one hundred twenty-three billion, thirty million, twenty-one thousand, thirteen".