2021939 has 4 divisors (see below), whose sum is σ = 2076624. Its totient is φ = 1967256.

The previous prime is 2021933. The next prime is 2021959. The reversal of 2021939 is 9391202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021939 - 2¹² = 2017843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27287 + ... + 27360.

It is an arithmetic number, because the mean of its divisors is an integer number (519156).

2^2021939 is an apocalyptic number.

2021939 is a deficient number, since it is larger than the sum of its proper divisors (54685).

2021939 is an equidigital number, since it uses as much as digits as its factorization.

2021939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54684.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2021939 is about 1421.9490145571. The cubic root of 2021939 is about 126.4511207991.

It can be divided in two parts, 202193 and 9, that added together give a palindrome (202202).

The spelling of 2021939 in words is "two million, twenty-one thousand, nine hundred thirty-nine".