21130302103 has 4 divisors (see below), whose sum is σ = 21858933240. Its totient is φ = 20401670968.

The previous prime is 21130302091. The next prime is 21130302163. The reversal of 21130302103 is 30120303112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130302103 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 (21130302163) 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, 364315525 + ... + 364315582.

It is an arithmetic number, because the mean of its divisors is an integer number (5464733310).

Almost surely, 2^21130302103 is an apocalyptic number.

21130302103 is a deficient number, since it is larger than the sum of its proper divisors (728631137).

21130302103 is an equidigital number, since it uses as much as digits as its factorization.

21130302103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728631136.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21130302103 its reverse (30120303112), we get a palindrome (51250605215).

The spelling of 21130302103 in words is "twenty-one billion, one hundred thirty million, three hundred two thousand, one hundred three".