21130030243 has 6 divisors (see below), whose sum is σ = 24579831156. Its totient is φ = 18111454452.

The previous prime is 21130030213. The next prime is 21130030247. The reversal of 21130030243 is 34203003112.

It is not a de Polignac number, because 21130030243 - 2¹³ = 21130022051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130030243.

It is not an unprimeable number, because it can be changed into a prime (21130030247) 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 5 ways as a sum of consecutive naturals, for example, 215612505 + ... + 215612602.

It is an arithmetic number, because the mean of its divisors is an integer number (4096638526).

Almost surely, 2^21130030243 is an apocalyptic number.

21130030243 is a deficient number, since it is larger than the sum of its proper divisors (3449800913).

21130030243 is an equidigital number, since it uses as much as digits as its factorization.

21130030243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431225121 (or 431225114 counting only the distinct ones).

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

Adding to 21130030243 its reverse (34203003112), we get a palindrome (55333033355).

The spelling of 21130030243 in words is "twenty-one billion, one hundred thirty million, thirty thousand, two hundred forty-three".