21752303 has 2 divisors, whose sum is σ = 21752304. Its totient is φ = 21752302.

The previous prime is 21752293. The next prime is 21752309. The reversal of 21752303 is 30325712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21752303 - 2⁶ = 21752239 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21752309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876151 + 10876152.

It is an arithmetic number, because the mean of its divisors is an integer number (10876152).

Almost surely, 2^21752303 is an apocalyptic number.

21752303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21752303 is an equidigital number, since it uses as much as digits as its factorization.

21752303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21752303 is about 4663.9364275256. The cubic root of 21752303 is about 279.1483604342.

The spelling of 21752303 in words is "twenty-one million, seven hundred fifty-two thousand, three hundred three".