21858827285 has 16 divisors (see below), whose sum is σ = 28314887040. Its totient is φ = 16149967680.

The previous prime is 21858827279. The next prime is 21858827299. The reversal of 21858827285 is 58272885812.

It is a happy number.

It is not a de Polignac number, because 21858827285 - 2⁴ = 21858827269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21858827285.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3273851 + ... + 3280520.

It is an arithmetic number, because the mean of its divisors is an integer number (1769680440).

Almost surely, 2^21858827285 is an apocalyptic number.

It is an amenable number.

21858827285 is a deficient number, since it is larger than the sum of its proper divisors (6456059755).

21858827285 is a wasteful number, since it uses less digits than its factorization.

21858827285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554428.

The product of its digits is 5734400, while the sum is 56.

The spelling of 21858827285 in words is "twenty-one billion, eight hundred fifty-eight million, eight hundred twenty-seven thousand, two hundred eighty-five".