21303030223 has 16 divisors (see below), whose sum is σ = 23005382400. Its totient is φ = 19660259520.

The previous prime is 21303030187. The next prime is 21303030233. The reversal of 21303030223 is 32203030312.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303030223 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21303030223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303030233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512038 + ... + 552076.

It is an arithmetic number, because the mean of its divisors is an integer number (1437836400).

Almost surely, 2^21303030223 is an apocalyptic number.

21303030223 is a deficient number, since it is larger than the sum of its proper divisors (1702352177).

21303030223 is a wasteful number, since it uses less digits than its factorization.

21303030223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40782.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21303030223 its reverse (32203030312), we get a palindrome (53506060535).

It can be divided in two parts, 213030 and 30223, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 21303030223 in words is "twenty-one billion, three hundred three million, thirty thousand, two hundred twenty-three".