21279423224 has 8 divisors (see below), whose sum is σ = 39898918560. Its totient is φ = 10639711608.

The previous prime is 21279423211. The next prime is 21279423233. The reversal of 21279423224 is 42232497212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21279423224² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1329963944 + ... + 1329963959.

It is an arithmetic number, because the mean of its divisors is an integer number (4987364820).

Almost surely, 2^21279423224 is an apocalyptic number.

It is an amenable number.

21279423224 is a deficient number, since it is larger than the sum of its proper divisors (18619495336).

21279423224 is a wasteful number, since it uses less digits than its factorization.

21279423224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659927909 (or 2659927905 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The spelling of 21279423224 in words is "twenty-one billion, two hundred seventy-nine million, four hundred twenty-three thousand, two hundred twenty-four".