21242144223 has 12 divisors (see below), whose sum is σ = 30689381320. Its totient is φ = 14158529136.

The previous prime is 21242144219. The next prime is 21242144227. The reversal of 21242144223 is 32244124212.

It is a happy number.

21242144223 is a `hidden beast` number, since 2 + 1 + 24 + 214 + 422 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21242144219) and next prime (21242144227).

It is not a de Polignac number, because 21242144223 - 2² = 21242144219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242144227) 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, 194833 + ... + 283626.

Almost surely, 2^21242144223 is an apocalyptic number.

21242144223 is a deficient number, since it is larger than the sum of its proper divisors (9447237097).

21242144223 is a wasteful number, since it uses less digits than its factorization.

21242144223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483398 (or 483395 counting only the distinct ones).

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

Adding to 21242144223 its reverse (32244124212), we get a palindrome (53486268435).

The spelling of 21242144223 in words is "twenty-one billion, two hundred forty-two million, one hundred forty-four thousand, two hundred twenty-three".