11021281 has 2 divisors, whose sum is σ = 11021282. Its totient is φ = 11021280.

The previous prime is 11021279. The next prime is 11021291. The reversal of 11021281 is 18212011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8904256 + 2117025 = 2984^2 + 1455^2 .

It is an emirp because it is prime and its reverse (18212011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11021281 - 2¹ = 11021279 is a prime.

It is a super-2 number, since 2×11021281² = 242937269761922, which contains 22 as substring.

Together with 11021279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510640 + 5510641.

It is an arithmetic number, because the mean of its divisors is an integer number (5510641).

Almost surely, 2^11021281 is an apocalyptic number.

It is an amenable number.

11021281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021281 is an equidigital number, since it uses as much as digits as its factorization.

11021281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 11021281 is about 3319.8314716262. The cubic root of 11021281 is about 222.5413364264.

Adding to 11021281 its reverse (18212011), we get a palindrome (29233292).

The spelling of 11021281 in words is "eleven million, twenty-one thousand, two hundred eighty-one".