124028521 has 4 divisors (see below), whose sum is σ = 124083844. Its totient is φ = 123973200.

The previous prime is 124028507. The next prime is 124028537. The reversal of 124028521 is 125820421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125820421 = 571 ⋅220351.

It can be written as a sum of positive squares in 2 ways, for example, as 109098025 + 14930496 = 10445^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 124028521 - 2⁷ = 124028393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124028501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24150 + ... + 28831.

It is an arithmetic number, because the mean of its divisors is an integer number (31020961).

Almost surely, 2^124028521 is an apocalyptic number.

It is an amenable number.

124028521 is a deficient number, since it is larger than the sum of its proper divisors (55323).

124028521 is an equidigital number, since it uses as much as digits as its factorization.

124028521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55322.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 124028521 is about 11136.8092827344. The cubic root of 124028521 is about 498.7013244708.

Adding to 124028521 its reverse (125820421), we get a palindrome (249848942).

The spelling of 124028521 in words is "one hundred twenty-four million, twenty-eight thousand, five hundred twenty-one".