21235336255 has 32 divisors (see below), whose sum is σ = 29760307200. Its totient is φ = 14242968960.

The previous prime is 21235336249. The next prime is 21235336267. The reversal of 21235336255 is 55263353212.

It is not a de Polignac number, because 21235336255 - 2⁵ = 21235336223 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3943665 + ... + 3949045.

It is an arithmetic number, because the mean of its divisors is an integer number (930009600).

Almost surely, 2^21235336255 is an apocalyptic number.

21235336255 is a deficient number, since it is larger than the sum of its proper divisors (8524970945).

21235336255 is a wasteful number, since it uses less digits than its factorization.

21235336255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7839.

The product of its digits is 162000, while the sum is 37.

Adding to 21235336255 its reverse (55263353212), we get a palindrome (76498689467).

The spelling of 21235336255 in words is "twenty-one billion, two hundred thirty-five million, three hundred thirty-six thousand, two hundred fifty-five".