21424120011 has 36 divisors (see below), whose sum is σ = 37239696000. Its totient is φ = 11820197088.

The previous prime is 21424119929. The next prime is 21424120021. The reversal of 21424120011 is 11002142412.

21424120011 is a `hidden beast` number, since 214 + 241 + 200 + 11 = 666.

It is not a de Polignac number, because 21424120011 - 2¹⁰ = 21424118987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21424120021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 824811 + ... + 850388.

It is an arithmetic number, because the mean of its divisors is an integer number (1034436000).

Almost surely, 2^21424120011 is an apocalyptic number.

21424120011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21424120011 is a deficient number, since it is larger than the sum of its proper divisors (15815575989).

21424120011 is a wasteful number, since it uses less digits than its factorization.

21424120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675248 (or 1675238 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21424120011 its reverse (11002142412), we get a palindrome (32426262423).

The spelling of 21424120011 in words is "twenty-one billion, four hundred twenty-four million, one hundred twenty thousand, eleven".