2021393 has 4 divisors (see below), whose sum is σ = 2205168. Its totient is φ = 1837620.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021393 is 3931202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021393 - 2⁴ = 2021377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021333) 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, 91871 + ... + 91892.

It is an arithmetic number, because the mean of its divisors is an integer number (551292).

2^2021393 is an apocalyptic number.

It is an amenable number.

2021393 is a deficient number, since it is larger than the sum of its proper divisors (183775).

2021393 is a wasteful number, since it uses less digits than its factorization.

2021393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183774.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 2021393 is about 1421.7570115881. The cubic root of 2021393 is about 126.4397375794.

Adding to 2021393 its reverse (3931202), we get a palindrome (5952595).

The spelling of 2021393 in words is "two million, twenty-one thousand, three hundred ninety-three".