521012103 has 4 divisors (see below), whose sum is σ = 694682808. Its totient is φ = 347341400.

The previous prime is 521012099. The next prime is 521012119. The reversal of 521012103 is 301210125.

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

It is a cyclic number.

It is not a de Polignac number, because 521012103 - 2² = 521012099 is a prime.

It is a super-2 number, since 2×521012103² = 542907222944965218, which contains 22 as substring.

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

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521012143) 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, 86835348 + ... + 86835353.

It is an arithmetic number, because the mean of its divisors is an integer number (173670702).

Almost surely, 2^521012103 is an apocalyptic number.

521012103 is a deficient number, since it is larger than the sum of its proper divisors (173670705).

521012103 is a wasteful number, since it uses less digits than its factorization.

521012103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173670704.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 521012103 is about 22825.6895405155. The cubic root of 521012103 is about 804.6665300895. Note that the first 3 decimals are identical.

Adding to 521012103 its reverse (301210125), we get a palindrome (822222228).

The spelling of 521012103 in words is "five hundred twenty-one million, twelve thousand, one hundred three".