21355435052563 has 2 divisors, whose sum is σ = 21355435052564. Its totient is φ = 21355435052562.

The previous prime is 21355435052533. The next prime is 21355435052629. The reversal of 21355435052563 is 36525053455312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21355435052563 - 2²⁹ = 21354898181651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21355435052533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677717526281 + 10677717526282.

It is an arithmetic number, because the mean of its divisors is an integer number (10677717526282).

Almost surely, 2^{21355435052563} is an apocalyptic number.

21355435052563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355435052563 is an equidigital number, since it uses as much as digits as its factorization.

21355435052563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100000, while the sum is 49.

The spelling of 21355435052563 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred thirty-five million, fifty-two thousand, five hundred sixty-three".