21424001223 has 4 divisors (see below), whose sum is σ = 28565334968. Its totient is φ = 14282667480.

The previous prime is 21424001213. The next prime is 21424001233. The reversal of 21424001223 is 32210042412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21424001213) and next prime (21424001233).

It is not a de Polignac number, because 21424001223 - 2⁹ = 21424000711 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21424001223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424001213) 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 3 ways as a sum of consecutive naturals, for example, 3570666868 + ... + 3570666873.

It is an arithmetic number, because the mean of its divisors is an integer number (7141333742).

Almost surely, 2^21424001223 is an apocalyptic number.

21424001223 is a deficient number, since it is larger than the sum of its proper divisors (7141333745).

21424001223 is an equidigital number, since it uses as much as digits as its factorization.

21424001223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141333744.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21424001223 its reverse (32210042412), we get a palindrome (53634043635).

The spelling of 21424001223 in words is "twenty-one billion, four hundred twenty-four million, one thousand, two hundred twenty-three".