21650753 has 2 divisors, whose sum is σ = 21650754. Its totient is φ = 21650752.

The previous prime is 21650737. The next prime is 21650789. The reversal of 21650753 is 35705612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 2745649 = 4348^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21650753 - 2⁴ = 21650737 is a prime.

It is a super-3 number, since 3×21650753³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21650653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825376 + 10825377.

It is an arithmetic number, because the mean of its divisors is an integer number (10825377).

Almost surely, 2^21650753 is an apocalyptic number.

It is an amenable number.

21650753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650753 is an equidigital number, since it uses as much as digits as its factorization.

21650753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 21650753 is about 4653.0369652518. The cubic root of 21650753 is about 278.7132839895.

The spelling of 21650753 in words is "twenty-one million, six hundred fifty thousand, seven hundred fifty-three".