505344504021 has 32 divisors (see below), whose sum is σ = 813218165760. Its totient is φ = 272678783616.

The previous prime is 505344504017. The next prime is 505344504043. The reversal of 505344504021 is 120405443505.

It is not a de Polignac number, because 505344504021 - 2² = 505344504017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505344504061) 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 31 ways as a sum of consecutive naturals, for example, 1940256 + ... + 2185241.

It is an arithmetic number, because the mean of its divisors is an integer number (25413067680).

Almost surely, 2^505344504021 is an apocalyptic number.

It is an amenable number.

505344504021 is a deficient number, since it is larger than the sum of its proper divisors (307873661739).

505344504021 is a wasteful number, since it uses less digits than its factorization.

505344504021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125833.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 505344504021 its reverse (120405443505), we get a palindrome (625749947526).

The spelling of 505344504021 in words is "five hundred five billion, three hundred forty-four million, five hundred four thousand, twenty-one".