500557761220021 has 8 divisors (see below), whose sum is σ = 530004716360280. Its totient is φ = 471111070629888.

The previous prime is 500557761219991. The next prime is 500557761220043. The reversal of 500557761220021 is 120022167755005.

It can be written as a sum of positive squares in 4 ways, for example, as 801452867121 + 499756308352900 = 895239^2 + 22355230^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 500557761220021 - 2³⁷ = 500420322266549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 500557761220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500557761220051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62235426 + ... + 69816643.

It is an arithmetic number, because the mean of its divisors is an integer number (66250589545035).

Almost surely, 2^{500557761220021} is an apocalyptic number.

It is an amenable number.

500557761220021 is a deficient number, since it is larger than the sum of its proper divisors (29446955140259).

500557761220021 is a wasteful number, since it uses less digits than its factorization.

500557761220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132275063.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 500557761220021 in words is "five hundred trillion, five hundred fifty-seven billion, seven hundred sixty-one million, two hundred twenty thousand, twenty-one".