21303430233 has 16 divisors (see below), whose sum is σ = 28625858880. Its totient is φ = 14091931584.

The previous prime is 21303430207. The next prime is 21303430241. The reversal of 21303430233 is 33203430312.

It is a happy number.

It is not a de Polignac number, because 21303430233 - 2²⁶ = 21236321369 is a prime.

It is a super-2 number, since 2×21303430233² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21303430243) 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, 264223 + ... + 335291.

It is an arithmetic number, because the mean of its divisors is an integer number (1789116180).

Almost surely, 2^21303430233 is an apocalyptic number.

It is an amenable number.

21303430233 is a deficient number, since it is larger than the sum of its proper divisors (7322428647).

21303430233 is a wasteful number, since it uses less digits than its factorization.

21303430233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71848.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21303430233 its reverse (33203430312), we get a palindrome (54506860545).

The spelling of 21303430233 in words is "twenty-one billion, three hundred three million, four hundred thirty thousand, two hundred thirty-three".