210221107816729 has 2 divisors, whose sum is σ = 210221107816730. Its totient is φ = 210221107816728.

The previous prime is 210221107816711. The next prime is 210221107816771. The reversal of 210221107816729 is 927618701122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207774927360000 + 2446180456729 = 14414400^2 + 1564027^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221107816729 - 2¹⁵ = 210221107783961 is a prime.

It is not a weakly prime, because it can be changed into another prime (210221107886729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110553908364 + 105110553908365.

It is an arithmetic number, because the mean of its divisors is an integer number (105110553908365).

Almost surely, 2^{210221107816729} is an apocalyptic number.

It is an amenable number.

210221107816729 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221107816729 is an equidigital number, since it uses as much as digits as its factorization.

210221107816729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 210221107816729 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred seven million, eight hundred sixteen thousand, seven hundred twenty-nine".