521442203 has 2 divisors, whose sum is σ = 521442204. Its totient is φ = 521442202.

The previous prime is 521442199. The next prime is 521442217. The reversal of 521442203 is 302244125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521442203 - 2² = 521442199 is a prime.

It is not a weakly prime, because it can be changed into another prime (521442253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260721101 + 260721102.

It is an arithmetic number, because the mean of its divisors is an integer number (260721102).

Almost surely, 2^521442203 is an apocalyptic number.

521442203 is a deficient number, since it is larger than the sum of its proper divisors (1).

521442203 is an equidigital number, since it uses as much as digits as its factorization.

521442203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 521442203 is about 22835.1089990830. The cubic root of 521442203 is about 804.8878889176.

Adding to 521442203 its reverse (302244125), we get a palindrome (823686328).

The spelling of 521442203 in words is "five hundred twenty-one million, four hundred forty-two thousand, two hundred three".