21104424401 has 4 divisors (see below), whose sum is σ = 22215183600. Its totient is φ = 19993665204.

The previous prime is 21104424347. The next prime is 21104424421. The reversal of 21104424401 is 10442440112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21104424401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21104424421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555379571 + ... + 555379608.

It is an arithmetic number, because the mean of its divisors is an integer number (5553795900).

Almost surely, 2^21104424401 is an apocalyptic number.

It is an amenable number.

21104424401 is a deficient number, since it is larger than the sum of its proper divisors (1110759199).

21104424401 is a wasteful number, since it uses less digits than its factorization.

21104424401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110759198.

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

Adding to 21104424401 its reverse (10442440112), we get a palindrome (31546864513).

The spelling of 21104424401 in words is "twenty-one billion, one hundred four million, four hundred twenty-four thousand, four hundred one".