21337733 has 2 divisors, whose sum is σ = 21337734. Its totient is φ = 21337732.

The previous prime is 21337717. The next prime is 21337759. The reversal of 21337733 is 33773312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 889249 = 4522^2 + 943^2 .

It is a cyclic number.

It is not a de Polignac number, because 21337733 - 2⁴ = 21337717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21337696 and 21337705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21337783) 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, 10668866 + 10668867.

It is an arithmetic number, because the mean of its divisors is an integer number (10668867).

Almost surely, 2^21337733 is an apocalyptic number.

It is an amenable number.

21337733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337733 is an equidigital number, since it uses as much as digits as its factorization.

21337733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 29.

The square root of 21337733 is about 4619.2784068510. The cubic root of 21337733 is about 277.3635744203.

The spelling of 21337733 in words is "twenty-one million, three hundred thirty-seven thousand, seven hundred thirty-three".