21016731719 has 8 divisors (see below), whose sum is σ = 21137108592. Its totient is φ = 20896473600.

The previous prime is 21016731713. The next prime is 21016731727. The reversal of 21016731719 is 91713761012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21016731719 is a prime.

It is a super-2 number, since 2×21016731719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 338252 + ... + 395534.

It is an arithmetic number, because the mean of its divisors is an integer number (2642138574).

Almost surely, 2^21016731719 is an apocalyptic number.

21016731719 is a deficient number, since it is larger than the sum of its proper divisors (120376873).

21016731719 is a wasteful number, since it uses less digits than its factorization.

21016731719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59377.

The product of its (nonzero) digits is 15876, while the sum is 38.

The spelling of 21016731719 in words is "twenty-one billion, sixteen million, seven hundred thirty-one thousand, seven hundred nineteen".