28342021 has 2 divisors, whose sum is σ = 28342022. Its totient is φ = 28342020.

The previous prime is 28341997. The next prime is 28342033. The reversal of 28342021 is 12024382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23328900 + 5013121 = 4830^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 28342021 - 2¹¹ = 28339973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28341983 and 28342001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28342051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14171010 + 14171011.

It is an arithmetic number, because the mean of its divisors is an integer number (14171011).

Almost surely, 2^28342021 is an apocalyptic number.

It is an amenable number.

28342021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28342021 is an equidigital number, since it uses as much as digits as its factorization.

28342021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28342021 is about 5323.7224758622. The cubic root of 28342021 is about 304.8902982703.

The spelling of 28342021 in words is "twenty-eight million, three hundred forty-two thousand, twenty-one".