21568255485 has 16 divisors (see below), whose sum is σ = 39439095936. Its totient is φ = 9859773888.

The previous prime is 21568255459. The next prime is 21568255519. The reversal of 21568255485 is 58455286512.

It is not a de Polignac number, because 21568255485 - 2¹² = 21568251389 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 15 ways as a sum of consecutive naturals, for example, 102705874 + ... + 102706083.

It is an arithmetic number, because the mean of its divisors is an integer number (2464943496).

Almost surely, 2^21568255485 is an apocalyptic number.

It is an amenable number.

21568255485 is a deficient number, since it is larger than the sum of its proper divisors (17870840451).

21568255485 is a wasteful number, since it uses less digits than its factorization.

21568255485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205411972.

The product of its digits is 3840000, while the sum is 51.

The spelling of 21568255485 in words is "twenty-one billion, five hundred sixty-eight million, two hundred fifty-five thousand, four hundred eighty-five".