21000541718 has 16 divisors (see below), whose sum is σ = 34353372480. Its totient is φ = 9569866176.

The previous prime is 21000541703. The next prime is 21000541729. The reversal of 21000541718 is 81714500012.

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5110055 + ... + 5114162.

It is an arithmetic number, because the mean of its divisors is an integer number (2147085780).

Almost surely, 2^21000541718 is an apocalyptic number.

21000541718 is a deficient number, since it is larger than the sum of its proper divisors (13352830762).

21000541718 is a wasteful number, since it uses less digits than its factorization.

21000541718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10224311.

The product of its (nonzero) digits is 2240, while the sum is 29.

The spelling of 21000541718 in words is "twenty-one billion, five hundred forty-one thousand, seven hundred eighteen".