2016021 has 8 divisors (see below), whose sum is σ = 3072064. Its totient is φ = 1152000.

The previous prime is 2016017. The next prime is 2016029. The reversal of 2016021 is 1206102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2016021 - 2² = 2016017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2015988 and 2016006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2016029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47980 + ... + 48021.

It is an arithmetic number, because the mean of its divisors is an integer number (384008).

2^2016021 is an apocalyptic number.

2016021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2016021 is a deficient number, since it is larger than the sum of its proper divisors (1056043).

2016021 is an equidigital number, since it uses as much as digits as its factorization.

2016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96011.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2016021 is about 1419.8665430244. The cubic root of 2016021 is about 126.3276305877.

The spelling of 2016021 in words is "two million, sixteen thousand, twenty-one".