2021131 has 4 divisors (see below), whose sum is σ = 2309872. Its totient is φ = 1732392.

The previous prime is 2021119. The next prime is 2021137. The reversal of 2021131 is 1311202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1311202 = 2 ⋅655601.

It is a cyclic number.

It is not a de Polignac number, because 2021131 - 2⁵ = 2021099 is a prime.

It is a super-2 number, since 2×2021131² = 8169941038322, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 144360 + ... + 144373.

It is an arithmetic number, because the mean of its divisors is an integer number (577468).

2^2021131 is an apocalyptic number.

2021131 is a deficient number, since it is larger than the sum of its proper divisors (288741).

2021131 is an equidigital number, since it uses as much as digits as its factorization.

2021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288740.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2021131 is about 1421.6648690884. The cubic root of 2021131 is about 126.4342745741.

Adding to 2021131 its reverse (1311202), we get a palindrome (3332333).

The spelling of 2021131 in words is "two million, twenty-one thousand, one hundred thirty-one".