21985116411885 has 32 divisors (see below), whose sum is σ = 38899692920448. Its totient is φ = 10513430507520.

The previous prime is 21985116411859. The next prime is 21985116412013. The reversal of 21985116411885 is 58811461158912.

It is not a de Polignac number, because 21985116411885 - 2²⁵ = 21985082857453 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 912612132 + ... + 912636221.

It is an arithmetic number, because the mean of its divisors is an integer number (1215615403764).

Almost surely, 2^{21985116411885} is an apocalyptic number.

It is an amenable number.

21985116411885 is a deficient number, since it is larger than the sum of its proper divisors (16914576508563).

21985116411885 is a wasteful number, since it uses less digits than its factorization.

21985116411885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825248445.

The product of its digits is 5529600, while the sum is 60.

The spelling of 21985116411885 in words is "twenty-one trillion, nine hundred eighty-five billion, one hundred sixteen million, four hundred eleven thousand, eight hundred eighty-five".