21224100004 has 24 divisors (see below), whose sum is σ = 38069817408. Its totient is φ = 10350146400.

The previous prime is 21224099959. The next prime is 21224100047. The reversal of 21224100004 is 40000142212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364984 + ... + 419119.

It is an arithmetic number, because the mean of its divisors is an integer number (1586242392).

Almost surely, 2^21224100004 is an apocalyptic number.

It is an amenable number.

21224100004 is a deficient number, since it is larger than the sum of its proper divisors (16845717404).

21224100004 is a wasteful number, since it uses less digits than its factorization.

21224100004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784275 (or 784273 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21224100004 its reverse (40000142212), we get a palindrome (61224242216).

The spelling of 21224100004 in words is "twenty-one billion, two hundred twenty-four million, one hundred thousand, four".