21335344011 has 6 divisors (see below), whose sum is σ = 30817719140. Its totient is φ = 14223562668.

The previous prime is 21335343947. The next prime is 21335344039. The reversal of 21335344011 is 11044353312.

It is a happy number.

21335344011 is a `hidden beast` number, since 213 + 3 + 5 + 3 + 440 + 1 + 1 = 666.

It is not a de Polignac number, because 21335344011 - 2⁶ = 21335343947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335344091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185296881 + ... + 1185296898.

Almost surely, 2^21335344011 is an apocalyptic number.

21335344011 is a deficient number, since it is larger than the sum of its proper divisors (9482375129).

21335344011 is a wasteful number, since it uses less digits than its factorization.

21335344011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370593785 (or 2370593782 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21335344011 its reverse (11044353312), we get a palindrome (32379697323).

The spelling of 21335344011 in words is "twenty-one billion, three hundred thirty-five million, three hundred forty-four thousand, eleven".