21336055393 has 2 divisors, whose sum is σ = 21336055394. Its totient is φ = 21336055392.

The previous prime is 21336055361. The next prime is 21336055423. The reversal of 21336055393 is 39355063312.

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., 19435705744 + 1900349649 = 139412^2 + 43593^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336055393 - 2⁵ = 21336055361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336055333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668027696 + 10668027697.

It is an arithmetic number, because the mean of its divisors is an integer number (10668027697).

Almost surely, 2^21336055393 is an apocalyptic number.

It is an amenable number.

21336055393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336055393 is an equidigital number, since it uses as much as digits as its factorization.

21336055393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 40.

The spelling of 21336055393 in words is "twenty-one billion, three hundred thirty-six million, fifty-five thousand, three hundred ninety-three".