2016115721 has 8 divisors (see below), whose sum is σ = 2100605184.
Its totient is φ = 1932842160.
The previous prime is 2016115691. The next prime is 2016115747. The reversal of 2016115721 is 1275116102.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2016115721 - 210 = 2016114697 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (2016115781) 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, 300590 + ... + 307223.
It is an arithmetic number, because the mean of its divisors is an integer number (262575648).
Almost surely, 22016115721 is an apocalyptic number.
It is an amenable number.
2016115721 is a deficient number, since it is larger than the sum of its proper divisors (84489463).
2016115721 is a wasteful number, since it uses less digits than its factorization.
2016115721 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 607951.
The product of its (nonzero) digits is 840, while the sum is 26.
The square root of 2016115721 is about 44901.1772785525.
The cubic root of 2016115721 is about 1263.2960902146.
The spelling of 2016115721 in words is "two billion, sixteen million, one hundred fifteen thousand, seven hundred twenty-one".