14217656306621 has 2 divisors, whose sum is σ = 14217656306622. Its totient is φ = 14217656306620.

The previous prime is 14217656306611. The next prime is 14217656306641. The reversal of 14217656306621 is 12660365671241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11794512650596 + 2423143656025 = 3434314^2 + 1556645^2 .

It is a cyclic number.

It is not a de Polignac number, because 14217656306621 - 2¹⁸ = 14217656044477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 14217656306621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14217656306611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7108828153310 + 7108828153311.

It is an arithmetic number, because the mean of its divisors is an integer number (7108828153311).

Almost surely, 2^{14217656306621} is an apocalyptic number.

It is an amenable number.

14217656306621 is a deficient number, since it is larger than the sum of its proper divisors (1).

14217656306621 is an equidigital number, since it uses as much as digits as its factorization.

14217656306621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 14217656306621 in words is "fourteen trillion, two hundred seventeen billion, six hundred fifty-six million, three hundred six thousand, six hundred twenty-one".