221173126247 has 2 divisors, whose sum is σ = 221173126248. Its totient is φ = 221173126246.

The previous prime is 221173126201. The next prime is 221173126267. The reversal of 221173126247 is 742621371122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221173126247 - 2¹⁴ = 221173109863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221173126247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221173126267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110586563123 + 110586563124.

It is an arithmetic number, because the mean of its divisors is an integer number (110586563124).

Almost surely, 2^221173126247 is an apocalyptic number.

221173126247 is a deficient number, since it is larger than the sum of its proper divisors (1).

221173126247 is an equidigital number, since it uses as much as digits as its factorization.

221173126247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

Adding to 221173126247 its reverse (742621371122), we get a palindrome (963794497369).

The spelling of 221173126247 in words is "two hundred twenty-one billion, one hundred seventy-three million, one hundred twenty-six thousand, two hundred forty-seven".