21200859859 has 2 divisors, whose sum is σ = 21200859860. Its totient is φ = 21200859858.

The previous prime is 21200859853. The next prime is 21200859887. The reversal of 21200859859 is 95895800212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200859859 - 2³³ = 12610925267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200859853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600429929 + 10600429930.

It is an arithmetic number, because the mean of its divisors is an integer number (10600429930).

Almost surely, 2^21200859859 is an apocalyptic number.

21200859859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200859859 is an equidigital number, since it uses as much as digits as its factorization.

21200859859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 49.

The spelling of 21200859859 in words is "twenty-one billion, two hundred million, eight hundred fifty-nine thousand, eight hundred fifty-nine".