123210013 has 4 divisors (see below), whose sum is σ = 123232320. Its totient is φ = 123187708.

The previous prime is 123209987. The next prime is 123210019. The reversal of 123210013 is 310012321.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123210013 - 2⁵ = 123209981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123209975 and 123210002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123210019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3948 + ... + 16186.

It is an arithmetic number, because the mean of its divisors is an integer number (30808080).

Almost surely, 2^123210013 is an apocalyptic number.

It is an amenable number.

123210013 is a deficient number, since it is larger than the sum of its proper divisors (22307).

123210013 is a wasteful number, since it uses less digits than its factorization.

123210013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22306.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 123210013 is about 11100.0005855856. Note that the first 3 decimals coincide. The cubic root of 123210013 is about 497.6018669716.

Subtracting from 123210013 its sum of digits (13), we obtain a square (123210000 = 11100²).

Adding to 123210013 its reverse (310012321), we get a palindrome (433222334).

The spelling of 123210013 in words is "one hundred twenty-three million, two hundred ten thousand, thirteen".