2021191 has 2 divisors, whose sum is σ = 2021192. Its totient is φ = 2021190.

The previous prime is 2021183. The next prime is 2021197. The reversal of 2021191 is 1911202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021191 - 2³ = 2021183 is a prime.

It is equal to p₁₅₀₄₁₅ and since 2021191 and 150415 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010595 + 1010596.

It is an arithmetic number, because the mean of its divisors is an integer number (1010596).

2^2021191 is an apocalyptic number.

2021191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021191 is an equidigital number, since it uses as much as digits as its factorization.

2021191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 2021191 is about 1421.6859709514. The cubic root of 2021191 is about 126.4355256857.

Adding to 2021191 its reverse (1911202), we get a palindrome (3932393).

It can be divided in two parts, 20211 and 91, that added together give a palindrome (20302).

The spelling of 2021191 in words is "two million, twenty-one thousand, one hundred ninety-one".