21296533 has 2 divisors, whose sum is σ = 21296534. Its totient is φ = 21296532.

The previous prime is 21296501. The next prime is 21296537. The reversal of 21296533 is 33569212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 3378244 = 4233^2 + 1838^2 .

It is a cyclic number.

It is not a de Polignac number, because 21296533 - 2⁵ = 21296501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21296495 and 21296504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21296537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10648266 + 10648267.

It is an arithmetic number, because the mean of its divisors is an integer number (10648267).

Almost surely, 2^21296533 is an apocalyptic number.

It is an amenable number.

21296533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21296533 is an equidigital number, since it uses as much as digits as its factorization.

21296533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 21296533 is about 4614.8166810828. The cubic root of 21296533 is about 277.1849434160.

The spelling of 21296533 in words is "twenty-one million, two hundred ninety-six thousand, five hundred thirty-three".