2021238217 has 2 divisors, whose sum is σ = 2021238218. Its totient is φ = 2021238216.

The previous prime is 2021238211. The next prime is 2021238227. The reversal of 2021238217 is 7128321202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108956601 + 912281616 = 33301^2 + 30204^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021238217 - 2¹⁵ = 2021205449 is a prime.

It is a super-2 number, since 2×2021238217² = 8170807859722678178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021238211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010619108 + 1010619109.

It is an arithmetic number, because the mean of its divisors is an integer number (1010619109).

Almost surely, 2^2021238217 is an apocalyptic number.

It is an amenable number.

2021238217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021238217 is an equidigital number, since it uses as much as digits as its factorization.

2021238217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2021238217 is about 44958.1829815218. The cubic root of 2021238217 is about 1264.3651023054.

Adding to 2021238217 its reverse (7128321202), we get a palindrome (9149559419).

The spelling of 2021238217 in words is "two billion, twenty-one million, two hundred thirty-eight thousand, two hundred seventeen".