255504021 has 8 divisors (see below), whose sum is σ = 341303904. Its totient is φ = 170020080.

The previous prime is 255504013. The next prime is 255504023. The reversal of 255504021 is 120405552.

It is a happy number.

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

It is not a de Polignac number, because 255504021 - 2³ = 255504013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255503982 and 255504000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255504023) 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 7 ways as a sum of consecutive naturals, for example, 77091 + ... + 80336.

It is an arithmetic number, because the mean of its divisors is an integer number (42662988).

Almost surely, 2^255504021 is an apocalyptic number.

It is an amenable number.

255504021 is a deficient number, since it is larger than the sum of its proper divisors (85799883).

255504021 is a wasteful number, since it uses less digits than its factorization.

255504021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157971.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 255504021 is about 15984.4931417921. The cubic root of 255504021 is about 634.5500944390.

Adding to 255504021 its reverse (120405552), we get a palindrome (375909573).

The spelling of 255504021 in words is "two hundred fifty-five million, five hundred four thousand, twenty-one".