21002330233 has 4 divisors (see below), whose sum is σ = 21167703040. Its totient is φ = 20836957428.

The previous prime is 21002330227. The next prime is 21002330267. The reversal of 21002330233 is 33203320012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21002330233 - 2²⁹ = 20465459321 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 21002330233.

It is not an unprimeable number, because it can be changed into a prime (21002330203) 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 3 ways as a sum of consecutive naturals, for example, 82686213 + ... + 82686466.

It is an arithmetic number, because the mean of its divisors is an integer number (5291925760).

Almost surely, 2^21002330233 is an apocalyptic number.

It is an amenable number.

21002330233 is a deficient number, since it is larger than the sum of its proper divisors (165372807).

21002330233 is a wasteful number, since it uses less digits than its factorization.

21002330233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165372806.

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

Adding to 21002330233 its reverse (33203320012), we get a palindrome (54205650245).

The spelling of 21002330233 in words is "twenty-one billion, two million, three hundred thirty thousand, two hundred thirty-three".