221188364417 has 4 divisors (see below), whose sum is σ = 221396837076. Its totient is φ = 220979891760.

The previous prime is 221188364389. The next prime is 221188364429. The reversal of 221188364417 is 714463881122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 714463881122 = 2 ⋅357231940561.

It can be written as a sum of positive squares in 2 ways, for example, as 157887817201 + 63300547216 = 397351^2 + 251596^2 .

It is a cyclic number.

It is not a de Polignac number, because 221188364417 - 2¹⁴ = 221188348033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221188364477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104234738 + ... + 104236859.

It is an arithmetic number, because the mean of its divisors is an integer number (55349209269).

Almost surely, 2^221188364417 is an apocalyptic number.

It is an amenable number.

221188364417 is a deficient number, since it is larger than the sum of its proper divisors (208472659).

221188364417 is a wasteful number, since it uses less digits than its factorization.

221188364417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208472658.

The product of its digits is 516096, while the sum is 47.

The spelling of 221188364417 in words is "two hundred twenty-one billion, one hundred eighty-eight million, three hundred sixty-four thousand, four hundred seventeen".