28022101 has 2 divisors, whose sum is σ = 28022102. Its totient is φ = 28022100.

The previous prime is 28022087. The next prime is 28022143. The reversal of 28022101 is 10122082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27815076 + 207025 = 5274^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 28022101 - 2⁹ = 28021589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28022161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14011050 + 14011051.

It is an arithmetic number, because the mean of its divisors is an integer number (14011051).

Almost surely, 2^28022101 is an apocalyptic number.

It is an amenable number.

28022101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28022101 is an equidigital number, since it uses as much as digits as its factorization.

28022101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 28022101 is about 5293.5905584017. The cubic root of 28022101 is about 303.7387710007.

Adding to 28022101 its reverse (10122082), we get a palindrome (38144183).

The spelling of 28022101 in words is "twenty-eight million, twenty-two thousand, one hundred one".