21204224411 has 4 divisors (see below), whose sum is σ = 21204552000. Its totient is φ = 21203896824.

The previous prime is 21204224407. The next prime is 21204224413. The reversal of 21204224411 is 11442240212.

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

It is a cyclic number.

It is not a de Polignac number, because 21204224411 - 2² = 21204224407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204224413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30596 + ... + 208193.

It is an arithmetic number, because the mean of its divisors is an integer number (5301138000).

Almost surely, 2^21204224411 is an apocalyptic number.

21204224411 is a deficient number, since it is larger than the sum of its proper divisors (327589).

21204224411 is an equidigital number, since it uses as much as digits as its factorization.

21204224411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327588.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21204224411 its reverse (11442240212), we get a palindrome (32646464623).

The spelling of 21204224411 in words is "twenty-one billion, two hundred four million, two hundred twenty-four thousand, four hundred eleven".