521400103 has 4 divisors (see below), whose sum is σ = 595885840. Its totient is φ = 446914368.

The previous prime is 521400101. The next prime is 521400119. The reversal of 521400103 is 301004125.

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 521400103 - 2¹ = 521400101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521400101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37242858 + ... + 37242871.

It is an arithmetic number, because the mean of its divisors is an integer number (148971460).

Almost surely, 2^521400103 is an apocalyptic number.

521400103 is a deficient number, since it is larger than the sum of its proper divisors (74485737).

521400103 is an equidigital number, since it uses as much as digits as its factorization.

521400103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74485736.

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

The square root of 521400103 is about 22834.1871543526. The cubic root of 521400103 is about 804.8662267584.

Adding to 521400103 its reverse (301004125), we get a palindrome (822404228).

The spelling of 521400103 in words is "five hundred twenty-one million, four hundred thousand, one hundred three".