523823172180021 has 48 divisors (see below), whose sum is σ = 881636377629696. Its totient is φ = 293520634115328.

The previous prime is 523823172180019. The next prime is 523823172180023. The reversal of 523823172180021 is 120081271328325.

It is a happy number.

523823172180021 is a `hidden beast` number, since 5 + 2 + 382 + 3 + 1 + 72 + 180 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (523823172180019) and next prime (523823172180023).

It is not a de Polignac number, because 523823172180021 - 2¹ = 523823172180019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523823172180023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 328393285 + ... + 329984538.

It is an arithmetic number, because the mean of its divisors is an integer number (18367424533952).

Almost surely, 2^{523823172180021} is an apocalyptic number.

It is an amenable number.

523823172180021 is a deficient number, since it is larger than the sum of its proper divisors (357813205449675).

523823172180021 is a wasteful number, since it uses less digits than its factorization.

523823172180021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658378082 (or 658378079 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 523823172180021 in words is "five hundred twenty-three trillion, eight hundred twenty-three billion, one hundred seventy-two million, one hundred eighty thousand, twenty-one".