21130012303 has 4 divisors (see below), whose sum is σ = 21282026920. Its totient is φ = 20977997688.

The previous prime is 21130012291. The next prime is 21130012339. The reversal of 21130012303 is 30321003112.

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-21130012303 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 (21130010303) 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, 76007100 + ... + 76007377.

It is an arithmetic number, because the mean of its divisors is an integer number (5320506730).

Almost surely, 2^21130012303 is an apocalyptic number.

21130012303 is a deficient number, since it is larger than the sum of its proper divisors (152014617).

21130012303 is a wasteful number, since it uses less digits than its factorization.

21130012303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152014616.

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

Adding to 21130012303 its reverse (30321003112), we get a palindrome (51451015415).

The spelling of 21130012303 in words is "twenty-one billion, one hundred thirty million, twelve thousand, three hundred three".