21344144233 has 8 divisors (see below), whose sum is σ = 22476484800. Its totient is φ = 20228831568.

The previous prime is 21344144219. The next prime is 21344144243. The reversal of 21344144233 is 33244144312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21344144233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21344144195 and 21344144204.

It is not an unprimeable number, because it can be changed into a prime (21344144243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254403 + ... + 4259416.

It is an arithmetic number, because the mean of its divisors is an integer number (2809560600).

Almost surely, 2^21344144233 is an apocalyptic number.

21344144233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21344144233 is a deficient number, since it is larger than the sum of its proper divisors (1132340567).

21344144233 is a wasteful number, since it uses less digits than its factorization.

21344144233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513951.

The product of its digits is 27648, while the sum is 31.

Adding to 21344144233 its reverse (33244144312), we get a palindrome (54588288545).

The spelling of 21344144233 in words is "twenty-one billion, three hundred forty-four million, one hundred forty-four thousand, two hundred thirty-three".