2016161005021 has 4 divisors (see below), whose sum is σ = 2016244572892. Its totient is φ = 2016077437152.

The previous prime is 2016161005003. The next prime is 2016161005031. The reversal of 2016161005021 is 1205001616102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 625070496996 + 1391090508025 = 790614^2 + 1179445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2016161005021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2016161005031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41747736 + ... + 41796001.

It is an arithmetic number, because the mean of its divisors is an integer number (504061143223).

Almost surely, 2^{2016161005021} is an apocalyptic number.

It is an amenable number.

2016161005021 is a deficient number, since it is larger than the sum of its proper divisors (83567871).

2016161005021 is an equidigital number, since it uses as much as digits as its factorization.

2016161005021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83567870.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 2016161005021 in words is "two trillion, sixteen billion, one hundred sixty-one million, five thousand, twenty-one".