2016015015721 has 16 divisors (see below), whose sum is σ = 2425454896000. Its totient is φ = 1636947595008.

The previous prime is 2016015015689. The next prime is 2016015015739. The reversal of 2016015015721 is 1275105106102.

It is a cyclic number.

It is not a de Polignac number, because 2016015015721 - 2⁵ = 2016015015689 is a prime.

It is a super-2 number, since 2×2016015015721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016015115721) 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, 1346161 + ... + 2417473.

It is an arithmetic number, because the mean of its divisors is an integer number (151590931000).

Almost surely, 2^{2016015015721} is an apocalyptic number.

It is an amenable number.

2016015015721 is a deficient number, since it is larger than the sum of its proper divisors (409439880279).

2016015015721 is a wasteful number, since it uses less digits than its factorization.

2016015015721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085488.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 2016015015721 in words is "two trillion, sixteen billion, fifteen million, fifteen thousand, seven hundred twenty-one".