521428203 has 12 divisors (see below), whose sum is σ = 762708960. Its totient is φ = 343218096.

The previous prime is 521428181. The next prime is 521428223. The reversal of 521428203 is 302824125.

It is not a de Polignac number, because 521428203 - 2⁶ = 521428139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521428223) 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 11 ways as a sum of consecutive naturals, for example, 365976 + ... + 367397.

It is an arithmetic number, because the mean of its divisors is an integer number (63559080).

Almost surely, 2^521428203 is an apocalyptic number.

521428203 is a deficient number, since it is larger than the sum of its proper divisors (241280757).

521428203 is a wasteful number, since it uses less digits than its factorization.

521428203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733458 (or 733455 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 521428203 is about 22834.8024515212. The cubic root of 521428203 is about 804.8806854786.

The spelling of 521428203 in words is "five hundred twenty-one million, four hundred twenty-eight thousand, two hundred three".