21766033 has 2 divisors, whose sum is σ = 21766034. Its totient is φ = 21766032.

The previous prime is 21766007. The next prime is 21766049. The reversal of 21766033 is 33066712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 8928144 = 3583^2 + 2988^2 .

It is a cyclic number.

It is not a de Polignac number, because 21766033 - 2¹⁷ = 21634961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21765992 and 21766010.

It is not a weakly prime, because it can be changed into another prime (21763033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10883016 + 10883017.

It is an arithmetic number, because the mean of its divisors is an integer number (10883017).

Almost surely, 2^21766033 is an apocalyptic number.

It is an amenable number.

21766033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21766033 is an equidigital number, since it uses as much as digits as its factorization.

21766033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21766033 is about 4665.4081279134. The cubic root of 21766033 is about 279.2070806668.

The spelling of 21766033 in words is "twenty-one million, seven hundred sixty-six thousand, thirty-three".