21302110243 has 16 divisors (see below), whose sum is σ = 22580490240. Its totient is φ = 20039832000.

The previous prime is 21302110223. The next prime is 21302110289. The reversal of 21302110243 is 34201120312.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21302110243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 21302110243.

It is not an unprimeable number, because it can be changed into a prime (21302110213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2176146 + ... + 2185912.

It is an arithmetic number, because the mean of its divisors is an integer number (1411280640).

Almost surely, 2^21302110243 is an apocalyptic number.

21302110243 is a deficient number, since it is larger than the sum of its proper divisors (1278379997).

21302110243 is a wasteful number, since it uses less digits than its factorization.

21302110243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10578.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21302110243 its reverse (34201120312), we get a palindrome (55503230555).

The spelling of 21302110243 in words is "twenty-one billion, three hundred two million, one hundred ten thousand, two hundred forty-three".