505216621 has 8 divisors (see below), whose sum is σ = 621805184. Its totient is φ = 399731760.

The previous prime is 505216619. The next prime is 505216639. The reversal of 505216621 is 126612505.

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 505216621 - 2¹ = 505216619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505216621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505216651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775825 + ... + 2776006.

It is an arithmetic number, because the mean of its divisors is an integer number (77725648).

Almost surely, 2^505216621 is an apocalyptic number.

It is an amenable number.

505216621 is a deficient number, since it is larger than the sum of its proper divisors (116588563).

505216621 is a wasteful number, since it uses less digits than its factorization.

505216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551851.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 505216621 is about 22477.0242914848. The cubic root of 505216621 is about 796.4512715385.

The spelling of 505216621 in words is "five hundred five million, two hundred sixteen thousand, six hundred twenty-one".