21748033 has 2 divisors, whose sum is σ = 21748034. Its totient is φ = 21748032.

The previous prime is 21748009. The next prime is 21748061. The reversal of 21748033 is 33084712.

It is an a-pointer prime, because the next prime (21748061) can be obtained adding 21748033 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 106929 = 4652^2 + 327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21748033 - 2¹⁷ = 21616961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21747992 and 21748010.

It is not a weakly prime, because it can be changed into another prime (21748063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10874016 + 10874017.

It is an arithmetic number, because the mean of its divisors is an integer number (10874017).

Almost surely, 2^21748033 is an apocalyptic number.

It is an amenable number.

21748033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21748033 is an equidigital number, since it uses as much as digits as its factorization.

21748033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21748033 is about 4663.4786372407. The cubic root of 21748033 is about 279.1300935331.

The spelling of 21748033 in words is "twenty-one million, seven hundred forty-eight thousand, thirty-three".