2021431 has 2 divisors, whose sum is σ = 2021432. Its totient is φ = 2021430.

The previous prime is 2021381. The next prime is 2021471. The reversal of 2021431 is 1341202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021431 is a prime.

It is a super-2 number, since 2×2021431² = 8172366575522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021471) 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 as a sum of consecutive naturals, namely, 1010715 + 1010716.

It is an arithmetic number, because the mean of its divisors is an integer number (1010716).

2^2021431 is an apocalyptic number.

2021431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021431 is an equidigital number, since it uses as much as digits as its factorization.

2021431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2021431 is about 1421.7703752716. The cubic root of 2021431 is about 126.4405298845.

Adding to 2021431 its reverse (1341202), we get a palindrome (3362633).

The spelling of 2021431 in words is "two million, twenty-one thousand, four hundred thirty-one".