221247607897 has 2 divisors, whose sum is σ = 221247607898. Its totient is φ = 221247607896.

The previous prime is 221247607813. The next prime is 221247607909. The reversal of 221247607897 is 798706742122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221183030601 + 64577296 = 470301^2 + 8036^2 .

It is a cyclic number.

It is not a de Polignac number, because 221247607897 - 2¹¹ = 221247605849 is a prime.

It is not a weakly prime, because it can be changed into another prime (224247607897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110623803948 + 110623803949.

It is an arithmetic number, because the mean of its divisors is an integer number (110623803949).

Almost surely, 2^221247607897 is an apocalyptic number.

It is an amenable number.

221247607897 is a deficient number, since it is larger than the sum of its proper divisors (1).

221247607897 is an equidigital number, since it uses as much as digits as its factorization.

221247607897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 221247607897 in words is "two hundred twenty-one billion, two hundred forty-seven million, six hundred seven thousand, eight hundred ninety-seven".