21857068571885 has 32 divisors (see below), whose sum is σ = 26707006689792. Its totient is φ = 17168952015360.

The previous prime is 21857068571873. The next prime is 21857068571903. The reversal of 21857068571885 is 58817586075812.

It is not a de Polignac number, because 21857068571885 - 2³² = 21852773604589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76345427 + ... + 76631183.

It is an arithmetic number, because the mean of its divisors is an integer number (834593959056).

Almost surely, 2^{21857068571885} is an apocalyptic number.

It is an amenable number.

21857068571885 is a deficient number, since it is larger than the sum of its proper divisors (4849938117907).

21857068571885 is a wasteful number, since it uses less digits than its factorization.

21857068571885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286773.

The product of its (nonzero) digits is 301056000, while the sum is 71.

The spelling of 21857068571885 in words is "twenty-one trillion, eight hundred fifty-seven billion, sixty-eight million, five hundred seventy-one thousand, eight hundred eighty-five".