21233753 has 2 divisors, whose sum is σ = 21233754. Its totient is φ = 21233752.

The previous prime is 21233689. The next prime is 21233813. The reversal of 21233753 is 35733212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15147664 + 6086089 = 3892^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233753 - 2⁶ = 21233689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21233453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616876 + 10616877.

It is an arithmetic number, because the mean of its divisors is an integer number (10616877).

Almost surely, 2^21233753 is an apocalyptic number.

It is an amenable number.

21233753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233753 is an equidigital number, since it uses as much as digits as its factorization.

21233753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 26.

The square root of 21233753 is about 4608.0096571079. The cubic root of 21233753 is about 276.9123043867.

Adding to 21233753 its reverse (35733212), we get a palindrome (56966965).

The spelling of 21233753 in words is "twenty-one million, two hundred thirty-three thousand, seven hundred fifty-three".