21066363859 has 2 divisors, whose sum is σ = 21066363860. Its totient is φ = 21066363858.

The previous prime is 21066363811. The next prime is 21066363869. The reversal of 21066363859 is 95836366012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21066363859 - 2²³ = 21057975251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21066363869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533181929 + 10533181930.

It is an arithmetic number, because the mean of its divisors is an integer number (10533181930).

Almost surely, 2^21066363859 is an apocalyptic number.

21066363859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21066363859 is an equidigital number, since it uses as much as digits as its factorization.

21066363859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 21066363859 in words is "twenty-one billion, sixty-six million, three hundred sixty-three thousand, eight hundred fifty-nine".