21404224211 has 8 divisors (see below), whose sum is σ = 22133574864. Its totient is φ = 20686929120.

The previous prime is 21404224207. The next prime is 21404224243. The reversal of 21404224211 is 11242240412.

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

It is a cyclic number.

It is not a de Polignac number, because 21404224211 - 2² = 21404224207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404224201) 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, 3010280 + ... + 3017381.

It is an arithmetic number, because the mean of its divisors is an integer number (2766696858).

Almost surely, 2^21404224211 is an apocalyptic number.

21404224211 is a deficient number, since it is larger than the sum of its proper divisors (729350653).

21404224211 is an equidigital number, since it uses as much as digits as its factorization.

21404224211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027781.

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

Adding to 21404224211 its reverse (11242240412), we get a palindrome (32646464623).

The spelling of 21404224211 in words is "twenty-one billion, four hundred four million, two hundred twenty-four thousand, two hundred eleven".