21635304226343 has 2 divisors, whose sum is σ = 21635304226344. Its totient is φ = 21635304226342.

The previous prime is 21635304226273. The next prime is 21635304226373. The reversal of 21635304226343 is 34362240353612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21635304226343 - 2²⁰ = 21635303177767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21635304226294 and 21635304226303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21635304226373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817652113171 + 10817652113172.

It is an arithmetic number, because the mean of its divisors is an integer number (10817652113172).

Almost surely, 2^{21635304226343} is an apocalyptic number.

21635304226343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21635304226343 is an equidigital number, since it uses as much as digits as its factorization.

21635304226343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 44.

Adding to 21635304226343 its reverse (34362240353612), we get a palindrome (55997544579955).

The spelling of 21635304226343 in words is "twenty-one trillion, six hundred thirty-five billion, three hundred four million, two hundred twenty-six thousand, three hundred forty-three".