2021306 has 8 divisors (see below), whose sum is σ = 3465120. Its totient is φ = 866268.

The previous prime is 2021291. The next prime is 2021321. The reversal of 2021306 is 6031202.

It is an interprime number because it is at equal distance from previous prime (2021291) and next prime (2021321).

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

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 144379 = 2021306 / (2 + 0 + 2 + 1 + 3 + 0 + 6).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72176 + ... + 72203.

It is an arithmetic number, because the mean of its divisors is an integer number (433140).

2^2021306 is an apocalyptic number.

2021306 is a deficient number, since it is larger than the sum of its proper divisors (1443814).

2021306 is a wasteful number, since it uses less digits than its factorization.

2021306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144388.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2021306 is about 1421.7264153134. The cubic root of 2021306 is about 126.4379235804.

Adding to 2021306 its reverse (6031202), we get a palindrome (8052508).

The spelling of 2021306 in words is "two million, twenty-one thousand, three hundred six".