21286033 has 2 divisors, whose sum is σ = 21286034. Its totient is φ = 21286032.

The previous prime is 21286009. The next prime is 21286037. The reversal of 21286033 is 33068212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 5349969 = 3992^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 21286033 - 2⁹ = 21285521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21285989 and 21286007.

It is not a weakly prime, because it can be changed into another prime (21286037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10643016 + 10643017.

It is an arithmetic number, because the mean of its divisors is an integer number (10643017).

Almost surely, 2^21286033 is an apocalyptic number.

It is an amenable number.

21286033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21286033 is an equidigital number, since it uses as much as digits as its factorization.

21286033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21286033 is about 4613.6789008339. The cubic root of 21286033 is about 277.1393816907.

The spelling of 21286033 in words is "twenty-one million, two hundred eighty-six thousand, thirty-three".