21227533 has 2 divisors, whose sum is σ = 21227534. Its totient is φ = 21227532.

The previous prime is 21227527. The next prime is 21227561. The reversal of 21227533 is 33572212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19342404 + 1885129 = 4398^2 + 1373^2 .

It is a cyclic number.

It is not a de Polignac number, because 21227533 - 2⁵ = 21227501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21227498 and 21227507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21227513) 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, 10613766 + 10613767.

It is an arithmetic number, because the mean of its divisors is an integer number (10613767).

Almost surely, 2^21227533 is an apocalyptic number.

It is an amenable number.

21227533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227533 is an equidigital number, since it uses as much as digits as its factorization.

21227533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 25.

The square root of 21227533 is about 4607.3346958952. The cubic root of 21227533 is about 276.8852631198.

Adding to 21227533 its reverse (33572212), we get a palindrome (54799745).

The spelling of 21227533 in words is "twenty-one million, two hundred twenty-seven thousand, five hundred thirty-three".