2016021011721 has 16 divisors (see below), whose sum is σ = 2704538833920. Its totient is φ = 1335771294080.

The previous prime is 2016021011701. The next prime is 2016021011723. The reversal of 2016021011721 is 1271101206102.

It is a cyclic number.

It is not a de Polignac number, because 2016021011721 - 2⁵ = 2016021011689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2016021011691 and 2016021011700.

It is not an unprimeable number, because it can be changed into a prime (2016021011723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 950820 + ... + 2221733.

It is an arithmetic number, because the mean of its divisors is an integer number (169033677120).

Almost surely, 2^{2016021011721} is an apocalyptic number.

It is an amenable number.

2016021011721 is a deficient number, since it is larger than the sum of its proper divisors (688517822199).

2016021011721 is a wasteful number, since it uses less digits than its factorization.

2016021011721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173856.

The product of its (nonzero) digits is 336, while the sum is 24.

Adding to 2016021011721 its reverse (1271101206102), we get a palindrome (3287122217823).

The spelling of 2016021011721 in words is "two trillion, sixteen billion, twenty-one million, eleven thousand, seven hundred twenty-one".