21748333 has 2 divisors, whose sum is σ = 21748334. Its totient is φ = 21748332.

The previous prime is 21748313. The next prime is 21748351. The reversal of 21748333 is 33384712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16305444 + 5442889 = 4038^2 + 2333^2 .

It is a cyclic number.

It is not a de Polignac number, because 21748333 - 2⁹ = 21747821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21748295 and 21748304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21748313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10874166 + 10874167.

It is an arithmetic number, because the mean of its divisors is an integer number (10874167).

Almost surely, 2^21748333 is an apocalyptic number.

It is an amenable number.

21748333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21748333 is an equidigital number, since it uses as much as digits as its factorization.

21748333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 21748333 is about 4663.5108019603. The cubic root of 21748333 is about 279.1313770000.

The spelling of 21748333 in words is "twenty-one million, seven hundred forty-eight thousand, three hundred thirty-three".