507530021 has 4 divisors (see below), whose sum is σ = 519908844. Its totient is φ = 495151200.

The previous prime is 507529993. The next prime is 507530069. The reversal of 507530021 is 120035705.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33988900 + 473541121 = 5830^2 + 21761^2 .

It is a cyclic number.

It is not a de Polignac number, because 507530021 - 2¹⁸ = 507267877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507532021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6189350 + ... + 6189431.

It is an arithmetic number, because the mean of its divisors is an integer number (129977211).

Almost surely, 2^507530021 is an apocalyptic number.

It is an amenable number.

507530021 is a deficient number, since it is larger than the sum of its proper divisors (12378823).

507530021 is a wasteful number, since it uses less digits than its factorization.

507530021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12378822.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 507530021 is about 22528.4269535181. The cubic root of 507530021 is about 797.6650777401.

Adding to 507530021 its reverse (120035705), we get a palindrome (627565726).

The spelling of 507530021 in words is "five hundred seven million, five hundred thirty thousand, twenty-one".