21603725718 has 64 divisors (see below), whose sum is σ = 46387697664. Its totient is φ = 6695136000.

The previous prime is 21603725713. The next prime is 21603725719. The reversal of 21603725718 is 81752730612.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21603725718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603725713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465738 + ... + 510018.

It is an arithmetic number, because the mean of its divisors is an integer number (724807776).

Almost surely, 2^21603725718 is an apocalyptic number.

21603725718 is an abundant number, since it is smaller than the sum of its proper divisors (24783971946).

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

21603725718 is a wasteful number, since it uses less digits than its factorization.

21603725718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44421.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21603725718 in words is "twenty-one billion, six hundred three million, seven hundred twenty-five thousand, seven hundred eighteen".