21214036536689 has 2 divisors, whose sum is σ = 21214036536690. Its totient is φ = 21214036536688.

The previous prime is 21214036536677. The next prime is 21214036536709. The reversal of 21214036536689 is 98663563041212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15104167142464 + 6109869394225 = 3886408^2 + 2471815^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214036536689 - 2²⁴ = 21214019759473 is a prime.

It is not a weakly prime, because it can be changed into another prime (21214036586689) 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, 10607018268344 + 10607018268345.

It is an arithmetic number, because the mean of its divisors is an integer number (10607018268345).

Almost surely, 2^{21214036536689} is an apocalyptic number.

It is an amenable number.

21214036536689 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214036536689 is an equidigital number, since it uses as much as digits as its factorization.

21214036536689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 21214036536689 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred eighty-nine".