21130403243 has 8 divisors (see below), whose sum is σ = 21193946400. Its totient is φ = 21066931008.

The previous prime is 21130403237. The next prime is 21130403293. The reversal of 21130403243 is 34230403112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21130403243 - 2⁴ = 21130403227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130403293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612293 + ... + 645881.

It is an arithmetic number, because the mean of its divisors is an integer number (2649243300).

Almost surely, 2^21130403243 is an apocalyptic number.

21130403243 is a deficient number, since it is larger than the sum of its proper divisors (63543157).

21130403243 is a wasteful number, since it uses less digits than its factorization.

21130403243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35461.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21130403243 its reverse (34230403112), we get a palindrome (55360806355).

The spelling of 21130403243 in words is "twenty-one billion, one hundred thirty million, four hundred three thousand, two hundred forty-three".