21130223203 has 4 divisors (see below), whose sum is σ = 21270158608. Its totient is φ = 20990287800.

The previous prime is 21130223201. The next prime is 21130223227. The reversal of 21130223203 is 30232203112.

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 21130223203 - 2¹ = 21130223201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130223201) 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, 69967476 + ... + 69967777.

It is an arithmetic number, because the mean of its divisors is an integer number (5317539652).

Almost surely, 2^21130223203 is an apocalyptic number.

21130223203 is a deficient number, since it is larger than the sum of its proper divisors (139935405).

21130223203 is a wasteful number, since it uses less digits than its factorization.

21130223203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139935404.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21130223203 its reverse (30232203112), we get a palindrome (51362426315).

The spelling of 21130223203 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-three thousand, two hundred three".