21144224223 has 12 divisors (see below), whose sum is σ = 30543193200. Its totient is φ = 14095440576.

The previous prime is 21144224201. The next prime is 21144224239. The reversal of 21144224223 is 32242244112.

It is a happy number.

21144224223 is a `hidden beast` number, since 2 + 1 + 14 + 422 + 4 + 223 = 666.

It is not a de Polignac number, because 21144224223 - 2¹⁸ = 21143962079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144222223) 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 11 ways as a sum of consecutive naturals, for example, 181303 + ... + 274151.

It is an arithmetic number, because the mean of its divisors is an integer number (2545266100).

Almost surely, 2^21144224223 is an apocalyptic number.

21144224223 is a deficient number, since it is larger than the sum of its proper divisors (9398968977).

21144224223 is a wasteful number, since it uses less digits than its factorization.

21144224223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118158 (or 118155 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 21144224223 its reverse (32242244112), we get a palindrome (53386468335).

The spelling of 21144224223 in words is "twenty-one billion, one hundred forty-four million, two hundred twenty-four thousand, two hundred twenty-three".