21424004411 has 4 divisors (see below), whose sum is σ = 21725751024. Its totient is φ = 21122257800.

The previous prime is 21424004389. The next prime is 21424004443. The reversal of 21424004411 is 11440042412.

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 21424004411 - 2³⁰ = 20350262587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424004611) 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, 150873200 + ... + 150873341.

It is an arithmetic number, because the mean of its divisors is an integer number (5431437756).

Almost surely, 2^21424004411 is an apocalyptic number.

21424004411 is a deficient number, since it is larger than the sum of its proper divisors (301746613).

21424004411 is an equidigital number, since it uses as much as digits as its factorization.

21424004411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301746612.

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

Adding to 21424004411 its reverse (11440042412), we get a palindrome (32864046823).

The spelling of 21424004411 in words is "twenty-one billion, four hundred twenty-four million, four thousand, four hundred eleven".