21653733506333 has 2 divisors, whose sum is σ = 21653733506334. Its totient is φ = 21653733506332.

The previous prime is 21653733506267. The next prime is 21653733506369. The reversal of 21653733506333 is 33360533735612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452029842649 + 6201703663684 = 3930907^2 + 2490322^2 .

It is a cyclic number.

It is not a de Polignac number, because 21653733506333 - 2¹⁸ = 21653733244189 is a prime.

It is a super-2 number, since 2×21653733506333² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21653733506533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826866753166 + 10826866753167.

It is an arithmetic number, because the mean of its divisors is an integer number (10826866753167).

Almost surely, 2^{21653733506333} is an apocalyptic number.

It is an amenable number.

21653733506333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653733506333 is an equidigital number, since it uses as much as digits as its factorization.

21653733506333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9185400, while the sum is 50.

The spelling of 21653733506333 in words is "twenty-one trillion, six hundred fifty-three billion, seven hundred thirty-three million, five hundred six thousand, three hundred thirty-three".