2016610721 has 4 divisors (see below), whose sum is σ = 2104289472. Its totient is φ = 1928931972.

The previous prime is 2016610709. The next prime is 2016610747. The reversal of 2016610721 is 1270166102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2016610721 - 2¹⁰ = 2016609697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016610751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43839341 + ... + 43839386.

It is an arithmetic number, because the mean of its divisors is an integer number (526072368).

Almost surely, 2^2016610721 is an apocalyptic number.

It is an amenable number.

2016610721 is a deficient number, since it is larger than the sum of its proper divisors (87678751).

2016610721 is an equidigital number, since it uses as much as digits as its factorization.

2016610721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87678750.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 2016610721 is about 44906.6890451746. The cubic root of 2016610721 is about 1263.3994705890.

Adding to 2016610721 its reverse (1270166102), we get a palindrome (3286776823).

The spelling of 2016610721 in words is "two billion, sixteen million, six hundred ten thousand, seven hundred twenty-one".