2021716 has 6 divisors (see below), whose sum is σ = 3538010. Its totient is φ = 1010856.

The previous prime is 2021711. The next prime is 2021729. The reversal of 2021716 is 6171202.

It can be written as a sum of positive squares in only one way, i.e., 1948816 + 72900 = 1396^2 + 270^2 .

It is a zygodrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 2021693 and 2021702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252711 + ... + 252718.

2^2021716 is an apocalyptic number.

It is an amenable number.

2021716 is a deficient number, since it is larger than the sum of its proper divisors (1516294).

2021716 is a wasteful number, since it uses less digits than its factorization.

2021716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505433 (or 505431 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 2021716 is about 1421.8705988943. The cubic root of 2021716 is about 126.4464718563.

Adding to 2021716 its reverse (6171202), we get a palindrome (8192918).

It can be divided in two parts, 20 and 21716, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 2021716 in words is "two million, twenty-one thousand, seven hundred sixteen".