28121033 has 2 divisors, whose sum is σ = 28121034. Its totient is φ = 28121032.

The previous prime is 28121029. The next prime is 28121047. The reversal of 28121033 is 33012182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23116864 + 5004169 = 4808^2 + 2237^2 .

It is a cyclic number.

It is not a de Polignac number, because 28121033 - 2² = 28121029 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28120996 and 28121014.

It is not a weakly prime, because it can be changed into another prime (28121053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060516 + 14060517.

It is an arithmetic number, because the mean of its divisors is an integer number (14060517).

Almost surely, 2^28121033 is an apocalyptic number.

It is an amenable number.

28121033 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121033 is an equidigital number, since it uses as much as digits as its factorization.

28121033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28121033 is about 5302.9268333629. The cubic root of 28121033 is about 304.0958009758.

The spelling of 28121033 in words is "twenty-eight million, one hundred twenty-one thousand, thirty-three".