505605021 has 16 divisors (see below), whose sum is σ = 703987200. Its totient is φ = 322168880.

The previous prime is 505605017. The next prime is 505605059. The reversal of 505605021 is 120506505.

It is a cyclic number.

It is not a de Polignac number, because 505605021 - 2² = 505605017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 505604982 and 505605000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505607021) 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 15 ways as a sum of consecutive naturals, for example, 143086 + ... + 146576.

It is an arithmetic number, because the mean of its divisors is an integer number (43999200).

Almost surely, 2^505605021 is an apocalyptic number.

It is an amenable number.

505605021 is a deficient number, since it is larger than the sum of its proper divisors (198382179).

505605021 is a wasteful number, since it uses less digits than its factorization.

505605021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5616.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 505605021 is about 22485.6625652881. The cubic root of 505605021 is about 796.6553176335.

The spelling of 505605021 in words is "five hundred five million, six hundred five thousand, twenty-one".