521120203 has 4 divisors (see below), whose sum is σ = 521169208. Its totient is φ = 521071200.

The previous prime is 521120183. The next prime is 521120207. The reversal of 521120203 is 302021125.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521120203 is a prime.

It is a super-2 number, since 2×521120203² = 543132531949522418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521120207) 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, 1101 + ... + 32302.

It is an arithmetic number, because the mean of its divisors is an integer number (130292302).

Almost surely, 2^521120203 is an apocalyptic number.

521120203 is a deficient number, since it is larger than the sum of its proper divisors (49005).

521120203 is a wasteful number, since it uses less digits than its factorization.

521120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49004.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 521120203 is about 22828.0573636917. The cubic root of 521120203 is about 804.7221771889.

Adding to 521120203 its reverse (302021125), we get a palindrome (823141328).

The spelling of 521120203 in words is "five hundred twenty-one million, one hundred twenty thousand, two hundred three".