2021623 has 8 divisors (see below), whose sum is σ = 2162160. Its totient is φ = 1883520.

The previous prime is 2021609. The next prime is 2021627. The reversal of 2021623 is 3261202.

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

It is a de Polignac number, because none of the positive numbers 2^k-2021623 is a prime.

It is a Duffinian number.

2021623 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2021597 and 2021606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (270270).

2^2021623 is an apocalyptic number.

2021623 is a deficient number, since it is larger than the sum of its proper divisors (140537).

2021623 is a wasteful number, since it uses less digits than its factorization.

2021623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2021623 is about 1421.8378951203. The cubic root of 2021623 is about 126.4445329585. Note that the first 3 decimals are identical.

Adding to 2021623 its reverse (3261202), we get a palindrome (5282825).

The spelling of 2021623 in words is "two million, twenty-one thousand, six hundred twenty-three".