28211101 has 2 divisors, whose sum is σ = 28211102. Its totient is φ = 28211100.

The previous prime is 28211093. The next prime is 28211123. The reversal of 28211101 is 10111282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22325625 + 5885476 = 4725^2 + 2426^2 .

It is a cyclic number.

It is not a de Polignac number, because 28211101 - 2³ = 28211093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28211191) 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, 14105550 + 14105551.

It is an arithmetic number, because the mean of its divisors is an integer number (14105551).

Almost surely, 2^28211101 is an apocalyptic number.

It is an amenable number.

28211101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211101 is an equidigital number, since it uses as much as digits as its factorization.

28211101 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 28211101 is about 5311.4123357164. The cubic root of 28211101 is about 304.4201147030.

Adding to 28211101 its reverse (10111282), we get a palindrome (38322383).

The spelling of 28211101 in words is "twenty-eight million, two hundred eleven thousand, one hundred one".