2216021 has 2 divisors, whose sum is σ = 2216022. Its totient is φ = 2216020.

The previous prime is 2215999. The next prime is 2216047. The reversal of 2216021 is 1206122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 835396 = 1175^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216021 - 2¹⁰ = 2214997 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2215987 and 2216005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2216321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108010 + 1108011.

It is an arithmetic number, because the mean of its divisors is an integer number (1108011).

2^2216021 is an apocalyptic number.

It is an amenable number.

2216021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216021 is an equidigital number, since it uses as much as digits as its factorization.

2216021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2216021 is about 1488.6305787535. The cubic root of 2216021 is about 130.3740901324.

The spelling of 2216021 in words is "two million, two hundred sixteen thousand, twenty-one".