123013021 has 4 divisors (see below), whose sum is σ = 123080572. Its totient is φ = 122945472.

The previous prime is 123013013. The next prime is 123013031. The reversal of 123013021 is 120310321.

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 9696996 + 113316025 = 3114^2 + 10645^2 .

It is a cyclic number.

It is not a de Polignac number, because 123013021 - 2³ = 123013013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123012992 and 123013010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123013001) 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, 30966 + ... + 34711.

It is an arithmetic number, because the mean of its divisors is an integer number (30770143).

Almost surely, 2^123013021 is an apocalyptic number.

It is an amenable number.

123013021 is a deficient number, since it is larger than the sum of its proper divisors (67551).

123013021 is an equidigital number, since it uses as much as digits as its factorization.

123013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67550.

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

The square root of 123013021 is about 11091.1235228898. The cubic root of 123013021 is about 497.3365317333.

Adding to 123013021 its reverse (120310321), we get a palindrome (243323342).

The spelling of 123013021 in words is "one hundred twenty-three million, thirteen thousand, twenty-one".