521212103 has 2 divisors, whose sum is σ = 521212104. Its totient is φ = 521212102.

The previous prime is 521212091. The next prime is 521212127. The reversal of 521212103 is 301212125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521212103 - 2¹⁸ = 520949959 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521212183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260606051 + 260606052.

It is an arithmetic number, because the mean of its divisors is an integer number (260606052).

Almost surely, 2^521212103 is an apocalyptic number.

521212103 is a deficient number, since it is larger than the sum of its proper divisors (1).

521212103 is an equidigital number, since it uses as much as digits as its factorization.

521212103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 521212103 is about 22830.0701488191. The cubic root of 521212103 is about 804.7694788931.

Adding to 521212103 its reverse (301212125), we get a palindrome (822424228).

The spelling of 521212103 in words is "five hundred twenty-one million, two hundred twelve thousand, one hundred three".