21204404411 has 8 divisors (see below), whose sum is σ = 22082814000. Its totient is φ = 20335809760.

The previous prime is 21204404399. The next prime is 21204404423. The reversal of 21204404411 is 11440440212.

It is an interprime number because it is at equal distance from previous prime (21204404399) and next prime (21204404423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204404411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204404911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2449325 + ... + 2457966.

It is an arithmetic number, because the mean of its divisors is an integer number (2760351750).

Almost surely, 2^21204404411 is an apocalyptic number.

21204404411 is a deficient number, since it is larger than the sum of its proper divisors (878409589).

21204404411 is a wasteful number, since it uses less digits than its factorization.

21204404411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907469.

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

Adding to 21204404411 its reverse (11440440212), we get a palindrome (32644844623).

The spelling of 21204404411 in words is "twenty-one billion, two hundred four million, four hundred four thousand, four hundred eleven".