213521105204103 has 4 divisors (see below), whose sum is σ = 284694806938808. Its totient is φ = 142347403469400.

The previous prime is 213521105204089. The next prime is 213521105204111. The reversal of 213521105204103 is 301402501125312.

It is a happy number.

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

It is not a de Polignac number, because 213521105204103 - 2¹⁰ = 213521105203079 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 (213521105204003) 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, 35586850867348 + ... + 35586850867353.

It is an arithmetic number, because the mean of its divisors is an integer number (71173701734702).

Almost surely, 2^{213521105204103} is an apocalyptic number.

213521105204103 is a deficient number, since it is larger than the sum of its proper divisors (71173701734705).

213521105204103 is an equidigital number, since it uses as much as digits as its factorization.

213521105204103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71173701734704.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 213521105204103 its reverse (301402501125312), we get a palindrome (514923606329415).

The spelling of 213521105204103 in words is "two hundred thirteen trillion, five hundred twenty-one billion, one hundred five million, two hundred four thousand, one hundred three".