123534021 has 16 divisors (see below), whose sum is σ = 177666944. Its totient is φ = 75898944.

The previous prime is 123534017. The next prime is 123534041. The reversal of 123534021 is 120435321.

It is not a de Polignac number, because 123534021 - 2² = 123534017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123534011) 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 15 ways as a sum of consecutive naturals, for example, 26175 + ... + 30531.

It is an arithmetic number, because the mean of its divisors is an integer number (11104184).

Almost surely, 2^123534021 is an apocalyptic number.

It is an amenable number.

123534021 is a deficient number, since it is larger than the sum of its proper divisors (54132923).

123534021 is a wasteful number, since it uses less digits than its factorization.

123534021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 123534021 is about 11114.5859572006. The cubic root of 123534021 is about 498.0376699300.

Adding to 123534021 its reverse (120435321), we get a palindrome (243969342).

The spelling of 123534021 in words is "one hundred twenty-three million, five hundred thirty-four thousand, twenty-one".