21224004412 has 24 divisors (see below), whose sum is σ = 40003838336. Its totient is φ = 9794530368.

The previous prime is 21224004401. The next prime is 21224004421. The reversal of 21224004412 is 21440042212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544693 + ... + 582355.

Almost surely, 2^21224004412 is an apocalyptic number.

It is an amenable number.

21224004412 is a deficient number, since it is larger than the sum of its proper divisors (18779833924).

21224004412 is a wasteful number, since it uses less digits than its factorization.

21224004412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48517 (or 48515 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21224004412 its reverse (21440042212), we get a palindrome (42664046624).

The spelling of 21224004412 in words is "twenty-one billion, two hundred twenty-four million, four thousand, four hundred twelve".