2021139 has 8 divisors (see below), whose sum is σ = 2994320. Its totient is φ = 1347408.

The previous prime is 2021137. The next prime is 2021143. The reversal of 2021139 is 9311202.

It is a happy number.

It is not a de Polignac number, because 2021139 - 2¹ = 2021137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021137) 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 7 ways as a sum of consecutive naturals, for example, 37402 + ... + 37455.

It is an arithmetic number, because the mean of its divisors is an integer number (374290).

2^2021139 is an apocalyptic number.

2021139 is a deficient number, since it is larger than the sum of its proper divisors (973181).

2021139 is an equidigital number, since it uses as much as digits as its factorization.

2021139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74866 (or 74860 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2021139 is about 1421.6676826882. The cubic root of 2021139 is about 126.4344413904.

The spelling of 2021139 in words is "two million, twenty-one thousand, one hundred thirty-nine".