123020321 has 4 divisors (see below), whose sum is σ = 123095700. Its totient is φ = 122944944.

The previous prime is 123020311. The next prime is 123020327.

It is a happy number.

123020321 is nontrivially palindromic in base 10.

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 26214400 + 96805921 = 5120^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 123020321 - 2¹⁰ = 123019297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123020296 and 123020305.

It is not an unprimeable number, because it can be changed into a prime (123020327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35186 + ... + 38523.

It is an arithmetic number, because the mean of its divisors is an integer number (30773925).

Almost surely, 2^123020321 is an apocalyptic number.

It is an amenable number.

123020321 is a deficient number, since it is larger than the sum of its proper divisors (75379).

123020321 is an equidigital number, since it uses as much as digits as its factorization.

123020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75378.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 123020321 is about 11091.4526100056. The cubic root of 123020321 is about 497.3463694043.

The spelling of 123020321 in words is "one hundred twenty-three million, twenty thousand, three hundred twenty-one".