21016731718 has 8 divisors (see below), whose sum is σ = 31546274040. Its totient is φ = 10501307040.

The previous prime is 21016731713. The next prime is 21016731727. The reversal of 21016731718 is 81713761012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016731713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525688 + ... + 3531643.

It is an arithmetic number, because the mean of its divisors is an integer number (3943284255).

Almost surely, 2^21016731718 is an apocalyptic number.

21016731718 is a deficient number, since it is larger than the sum of its proper divisors (10529542322).

21016731718 is a wasteful number, since it uses less digits than its factorization.

21016731718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058822.

The product of its (nonzero) digits is 14112, while the sum is 37.

The spelling of 21016731718 in words is "twenty-one billion, sixteen million, seven hundred thirty-one thousand, seven hundred eighteen".