21110091852 has 24 divisors (see below), whose sum is σ = 49264928496. Its totient is φ = 7035547648.

The previous prime is 21110091833. The next prime is 21110091869. The reversal of 21110091852 is 25819001112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65493 + ... + 215660.

It is an arithmetic number, because the mean of its divisors is an integer number (2052705354).

Almost surely, 2^21110091852 is an apocalyptic number.

It is an amenable number.

21110091852 is an abundant number, since it is smaller than the sum of its proper divisors (28154836644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110091852 is a wasteful number, since it uses less digits than its factorization.

21110091852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287417 (or 287415 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 30.

Adding to 21110091852 its reverse (25819001112), we get a palindrome (46929092964).

The spelling of 21110091852 in words is "twenty-one billion, one hundred ten million, ninety-one thousand, eight hundred fifty-two".