21750845718 has 32 divisors (see below), whose sum is σ = 50558872320. Its totient is φ = 6109195680.

The previous prime is 21750845713. The next prime is 21750845729. The reversal of 21750845718 is 81754805712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21750845713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4386313 + ... + 4391268.

It is an arithmetic number, because the mean of its divisors is an integer number (1579964760).

Almost surely, 2^21750845718 is an apocalyptic number.

21750845718 is an abundant number, since it is smaller than the sum of its proper divisors (28808026602).

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

21750845718 is a wasteful number, since it uses less digits than its factorization.

21750845718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777652.

The product of its (nonzero) digits is 627200, while the sum is 48.

The spelling of 21750845718 in words is "twenty-one billion, seven hundred fifty million, eight hundred forty-five thousand, seven hundred eighteen".