21143324233 has 4 divisors (see below), whose sum is σ = 21148292880. Its totient is φ = 21138355588.

The previous prime is 21143324221. The next prime is 21143324327. The reversal of 21143324233 is 33242334112.

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 21143324233 - 2²⁵ = 21109769801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143324833) 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, 2477935 + ... + 2486452.

It is an arithmetic number, because the mean of its divisors is an integer number (5287073220).

Almost surely, 2^21143324233 is an apocalyptic number.

It is an amenable number.

21143324233 is a deficient number, since it is larger than the sum of its proper divisors (4968647).

21143324233 is an equidigital number, since it uses as much as digits as its factorization.

21143324233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968646.

The product of its digits is 10368, while the sum is 28.

Adding to 21143324233 its reverse (33242334112), we get a palindrome (54385658345).

The spelling of 21143324233 in words is "twenty-one billion, one hundred forty-three million, three hundred twenty-four thousand, two hundred thirty-three".