2021443261 has 2 divisors, whose sum is σ = 2021443262. Its totient is φ = 2021443260.

The previous prime is 2021443187. The next prime is 2021443283. The reversal of 2021443261 is 1623441202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1396143225 + 625300036 = 37365^2 + 25006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021443261 - 2¹³ = 2021435069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021443661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010721630 + 1010721631.

It is an arithmetic number, because the mean of its divisors is an integer number (1010721631).

Almost surely, 2^2021443261 is an apocalyptic number.

It is an amenable number.

2021443261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021443261 is an equidigital number, since it uses as much as digits as its factorization.

2021443261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 2021443261 is about 44960.4633094456. The cubic root of 2021443261 is about 1264.4078552592.

Adding to 2021443261 its reverse (1623441202), we get a palindrome (3644884463).

The spelling of 2021443261 in words is "two billion, twenty-one million, four hundred forty-three thousand, two hundred sixty-one".