4128121575 has 36 divisors (see below), whose sum is σ = 7461802920. Its totient is φ = 2181453120.

The previous prime is 4128121567. The next prime is 4128121579. The reversal of 4128121575 is 5751218214.

It is a happy number.

4128121575 is a `hidden beast` number, since 4 + 1 + 2 + 81 + 2 + 1 + 575 = 666.

It is not a de Polignac number, because 4128121575 - 2³ = 4128121567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4128121579) 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 35 ways as a sum of consecutive naturals, for example, 59637 + ... + 108686.

Almost surely, 2^4128121575 is an apocalyptic number.

4128121575 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

4128121575 is a deficient number, since it is larger than the sum of its proper divisors (3333681345).

4128121575 is a wasteful number, since it uses less digits than its factorization.

4128121575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168448 (or 168440 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 4128121575 is about 64250.4597259817. The cubic root of 4128121575 is about 1604.1716108316.

Adding to 4128121575 its reverse (5751218214), we get a palindrome (9879339789).

The spelling of 4128121575 in words is "four billion, one hundred twenty-eight million, one hundred twenty-one thousand, five hundred seventy-five".