123563021 has 8 divisors (see below), whose sum is σ = 131000184. Its totient is φ = 116144640.

The previous prime is 123562991. The next prime is 123563029. The reversal of 123563021 is 120365321.

It can be written as a sum of positive squares in 4 ways, for example, as 8236900 + 115326121 = 2870^2 + 10739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123563021 - 2¹⁴ = 123546637 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 (123563029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10241 + ... + 18761.

It is an arithmetic number, because the mean of its divisors is an integer number (16375023).

Almost surely, 2^123563021 is an apocalyptic number.

It is an amenable number.

123563021 is a deficient number, since it is larger than the sum of its proper divisors (7437163).

123563021 is an equidigital number, since it uses as much as digits as its factorization.

123563021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 123563021 is about 11115.8904726522. The cubic root of 123563021 is about 498.0766388506.

The spelling of 123563021 in words is "one hundred twenty-three million, five hundred sixty-three thousand, twenty-one".