21305243103341 has 2 divisors, whose sum is σ = 21305243103342. Its totient is φ = 21305243103340.

The previous prime is 21305243103311. The next prime is 21305243103367. The reversal of 21305243103341 is 14330134250312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21304261847716 + 981255625 = 4615654^2 + 31325^2 .

It is a cyclic number.

It is not a de Polignac number, because 21305243103341 - 2¹⁰ = 21305243102317 is a prime.

It is a super-3 number, since 3×21305243103341³ (a number of 41 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21305243103298 and 21305243103307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21305243103301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652621551670 + 10652621551671.

It is an arithmetic number, because the mean of its divisors is an integer number (10652621551671).

Almost surely, 2^{21305243103341} is an apocalyptic number.

It is an amenable number.

21305243103341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21305243103341 is an equidigital number, since it uses as much as digits as its factorization.

21305243103341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 21305243103341 its reverse (14330134250312), we get a palindrome (35635377353653).

The spelling of 21305243103341 in words is "twenty-one trillion, three hundred five billion, two hundred forty-three million, one hundred three thousand, three hundred forty-one".