21110075255 has 16 divisors (see below), whose sum is σ = 25715343360. Its totient is φ = 16634473632.

The previous prime is 21110075251. The next prime is 21110075293. The reversal of 21110075255 is 55257001112.

It is a cyclic number.

It is not a de Polignac number, because 21110075255 - 2² = 21110075251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110075251) 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 15 ways as a sum of consecutive naturals, for example, 31319 + ... + 207848.

It is an arithmetic number, because the mean of its divisors is an integer number (1607208960).

Almost surely, 2^21110075255 is an apocalyptic number.

21110075255 is a deficient number, since it is larger than the sum of its proper divisors (4605268105).

21110075255 is a wasteful number, since it uses less digits than its factorization.

21110075255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239438.

The product of its (nonzero) digits is 3500, while the sum is 29.

Adding to 21110075255 its reverse (55257001112), we get a palindrome (76367076367).

The spelling of 21110075255 in words is "twenty-one billion, one hundred ten million, seventy-five thousand, two hundred fifty-five".