524256021 has 12 divisors (see below), whose sum is σ = 769673580. Its totient is φ = 343774080.

The previous prime is 524255993. The next prime is 524256077. The reversal of 524256021 is 120652425.

524256021 is a `hidden beast` number, since 52 + 4 + 2 + 5 + 602 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 298805796 + 225450225 = 17286^2 + 15015^2 .

It is not a de Polignac number, because 524256021 - 2⁵ = 524255989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (524254021) 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 11 ways as a sum of consecutive naturals, for example, 476916 + ... + 478013.

It is an arithmetic number, because the mean of its divisors is an integer number (64139465).

Almost surely, 2^524256021 is an apocalyptic number.

It is an amenable number.

524256021 is a deficient number, since it is larger than the sum of its proper divisors (245417559).

524256021 is a wasteful number, since it uses less digits than its factorization.

524256021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954996 (or 954993 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 524256021 is about 22896.6377662748. The cubic root of 524256021 is about 806.3330771433. Note that the first 3 decimals are identical.

The spelling of 524256021 in words is "five hundred twenty-four million, two hundred fifty-six thousand, twenty-one".