2021347 has 4 divisors (see below), whose sum is σ = 2076016. Its totient is φ = 1966680.

The previous prime is 2021339. The next prime is 2021377. The reversal of 2021347 is 7431202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7431202 = 2 ⋅3715601.

It is a cyclic number.

It is not a de Polignac number, because 2021347 - 2³ = 2021339 is a prime.

It is a Duffinian number.

2021347 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2021377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27279 + ... + 27352.

It is an arithmetic number, because the mean of its divisors is an integer number (519004).

2^2021347 is an apocalyptic number.

2021347 is a deficient number, since it is larger than the sum of its proper divisors (54669).

2021347 is an equidigital number, since it uses as much as digits as its factorization.

2021347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54668.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 2021347 is about 1421.7408343295. The cubic root of 2021347 is about 126.4387784600.

Adding to 2021347 its reverse (7431202), we get a palindrome (9452549).

The spelling of 2021347 in words is "two million, twenty-one thousand, three hundred forty-seven".