21012936189859 has 2 divisors, whose sum is σ = 21012936189860. Its totient is φ = 21012936189858.

The previous prime is 21012936189757. The next prime is 21012936189929. The reversal of 21012936189859 is 95898163921012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012936189859 - 2⁹ = 21012936189347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012936189859.

It is not a weakly prime, because it can be changed into another prime (21012936129859) 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, 10506468094929 + 10506468094930.

It is an arithmetic number, because the mean of its divisors is an integer number (10506468094930).

Almost surely, 2^{21012936189859} is an apocalyptic number.

21012936189859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012936189859 is an equidigital number, since it uses as much as digits as its factorization.

21012936189859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16796160, while the sum is 64.

The spelling of 21012936189859 in words is "twenty-one trillion, twelve billion, nine hundred thirty-six million, one hundred eighty-nine thousand, eight hundred fifty-nine".