506445021 has 8 divisors (see below), whose sum is σ = 750288960. Its totient is φ = 337629996.

The previous prime is 506444993. The next prime is 506445029. The reversal of 506445021 is 120544605.

It is not a de Polignac number, because 506445021 - 2⁵ = 506444989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 18757223 = 506445021 / (5 + 0 + 6 + 4 + 4 + 5 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506445029) 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, 9378585 + ... + 9378638.

It is an arithmetic number, because the mean of its divisors is an integer number (93786120).

Almost surely, 2^506445021 is an apocalyptic number.

It is an amenable number.

506445021 is a deficient number, since it is larger than the sum of its proper divisors (243843939).

506445021 is a wasteful number, since it uses less digits than its factorization.

506445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18757232 (or 18757226 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 506445021 is about 22504.3333827065. Note that the first 4 decimals coincide. The cubic root of 506445021 is about 797.0962548529.

Adding to 506445021 its reverse (120544605), we get a palindrome (626989626).

The spelling of 506445021 in words is "five hundred six million, four hundred forty-five thousand, twenty-one".