21707354563 has 2 divisors, whose sum is σ = 21707354564. Its totient is φ = 21707354562.

The previous prime is 21707354443. The next prime is 21707354609. The reversal of 21707354563 is 36545370712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21707354563 - 2²⁵ = 21673800131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21707357563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10853677281 + 10853677282.

It is an arithmetic number, because the mean of its divisors is an integer number (10853677282).

Almost surely, 2^21707354563 is an apocalyptic number.

21707354563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21707354563 is an equidigital number, since it uses as much as digits as its factorization.

21707354563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 21707354563 in words is "twenty-one billion, seven hundred seven million, three hundred fifty-four thousand, five hundred sixty-three".