15221055502417 has 2 divisors, whose sum is σ = 15221055502418. Its totient is φ = 15221055502416.

The previous prime is 15221055502363. The next prime is 15221055502423. The reversal of 15221055502417 is 71420555012251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12292589954241 + 2928465548176 = 3506079^2 + 1711276^2 .

It is an emirp because it is prime and its reverse (71420555012251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15221055502417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15221055502417.

It is not a weakly prime, because it can be changed into another prime (15221055502817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610527751208 + 7610527751209.

It is an arithmetic number, because the mean of its divisors is an integer number (7610527751209).

Almost surely, 2^{15221055502417} is an apocalyptic number.

It is an amenable number.

15221055502417 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221055502417 is an equidigital number, since it uses as much as digits as its factorization.

15221055502417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140000, while the sum is 40.

The spelling of 15221055502417 in words is "fifteen trillion, two hundred twenty-one billion, fifty-five million, five hundred two thousand, four hundred seventeen".