2021057281 has 2 divisors, whose sum is σ = 2021057282. Its totient is φ = 2021057280.

The previous prime is 2021057267. The next prime is 2021057329. The reversal of 2021057281 is 1827501202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1760557681 + 260499600 = 41959^2 + 16140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021057281 - 2¹⁷ = 2020926209 is a prime.

It is a super-2 number, since 2×2021057281² = 8169345066166225922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021057201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010528640 + 1010528641.

It is an arithmetic number, because the mean of its divisors is an integer number (1010528641).

Almost surely, 2^2021057281 is an apocalyptic number.

It is an amenable number.

2021057281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021057281 is an equidigital number, since it uses as much as digits as its factorization.

2021057281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 2021057281 is about 44956.1706665503. The cubic root of 2021057281 is about 1264.3273736186.

Adding to 2021057281 its reverse (1827501202), we get a palindrome (3848558483).

The spelling of 2021057281 in words is "two billion, twenty-one million, fifty-seven thousand, two hundred eighty-one".