21124330233 has 4 divisors (see below), whose sum is σ = 28165773648. Its totient is φ = 14082886820.

The previous prime is 21124330223. The next prime is 21124330379. The reversal of 21124330233 is 33203342112.

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 21124330233 - 2¹² = 21124326137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124330223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520721703 + ... + 3520721708.

It is an arithmetic number, because the mean of its divisors is an integer number (7041443412).

Almost surely, 2^21124330233 is an apocalyptic number.

It is an amenable number.

21124330233 is a deficient number, since it is larger than the sum of its proper divisors (7041443415).

21124330233 is an equidigital number, since it uses as much as digits as its factorization.

21124330233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041443414.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21124330233 its reverse (33203342112), we get a palindrome (54327672345).

The spelling of 21124330233 in words is "twenty-one billion, one hundred twenty-four million, three hundred thirty thousand, two hundred thirty-three".