21041320103 has 4 divisors (see below), whose sum is σ = 21277739520. Its totient is φ = 20804900688.

The previous prime is 21041320093. The next prime is 21041320117. The reversal of 21041320103 is 30102314012.

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 21041320103 - 2¹⁴ = 21041303719 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 (21041320403) 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, 118209575 + ... + 118209752.

It is an arithmetic number, because the mean of its divisors is an integer number (5319434880).

Almost surely, 2^21041320103 is an apocalyptic number.

21041320103 is a deficient number, since it is larger than the sum of its proper divisors (236419417).

21041320103 is an equidigital number, since it uses as much as digits as its factorization.

21041320103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236419416.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21041320103 its reverse (30102314012), we get a palindrome (51143634115).

The spelling of 21041320103 in words is "twenty-one billion, forty-one million, three hundred twenty thousand, one hundred three".