21010250255 has 16 divisors (see below), whose sum is σ = 26555088000. Its totient is φ = 15914063520.

The previous prime is 21010250227. The next prime is 21010250297. The reversal of 21010250255 is 55205201012.

It is not a de Polignac number, because 21010250255 - 2⁸ = 21010249999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010250255.

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, 96320 + ... + 226490.

It is an arithmetic number, because the mean of its divisors is an integer number (1659693000).

Almost surely, 2^21010250255 is an apocalyptic number.

21010250255 is a deficient number, since it is larger than the sum of its proper divisors (5544837745).

21010250255 is a wasteful number, since it uses less digits than its factorization.

21010250255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131894.

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 21010250255 its reverse (55205201012), we get a palindrome (76215451267).

The spelling of 21010250255 in words is "twenty-one billion, ten million, two hundred fifty thousand, two hundred fifty-five".