21050225255 has 16 divisors (see below), whose sum is σ = 26362584000. Its totient is φ = 16105529088.

The previous prime is 21050225179. The next prime is 21050225281. The reversal of 21050225255 is 55252205012.

It is a cyclic number.

It is not a de Polignac number, because 21050225255 - 2¹⁰ = 21050224231 is a prime.

It is a super-2 number, since 2×21050225255² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 1177121 + ... + 1194869.

It is an arithmetic number, because the mean of its divisors is an integer number (1647661500).

Almost surely, 2^21050225255 is an apocalyptic number.

21050225255 is a deficient number, since it is larger than the sum of its proper divisors (5312358745).

21050225255 is a wasteful number, since it uses less digits than its factorization.

21050225255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28090.

The product of its (nonzero) digits is 10000, while the sum is 29.

The spelling of 21050225255 in words is "twenty-one billion, fifty million, two hundred twenty-five thousand, two hundred fifty-five".