21354544607633 has 2 divisors, whose sum is σ = 21354544607634. Its totient is φ = 21354544607632.

The previous prime is 21354544607609. The next prime is 21354544607659. The reversal of 21354544607633 is 33670644545312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20467589388544 + 886955219089 = 4524112^2 + 941783^2 .

It is a cyclic number.

It is not a de Polignac number, because 21354544607633 - 2⁸ = 21354544607377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21354544607603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677272303816 + 10677272303817.

It is an arithmetic number, because the mean of its divisors is an integer number (10677272303817).

Almost surely, 2^{21354544607633} is an apocalyptic number.

It is an amenable number.

21354544607633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354544607633 is an equidigital number, since it uses as much as digits as its factorization.

21354544607633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 53.

The spelling of 21354544607633 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-four million, six hundred seven thousand, six hundred thirty-three".