221287449745 has 8 divisors (see below), whose sum is σ = 272721830184. Its totient is φ = 172245366144.

The previous prime is 221287449737. The next prime is 221287449751. The reversal of 221287449745 is 547944782122.

It is a happy number.

It is a Cunningham number, because it is equal to 470412²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 79663933504 + 141623516241 = 282248^2 + 376329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221287449745 - 2³ = 221287449737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598074004 + ... + 598074373.

It is an arithmetic number, because the mean of its divisors is an integer number (34090228773).

Almost surely, 2^221287449745 is an apocalyptic number.

It is an amenable number.

221287449745 is a deficient number, since it is larger than the sum of its proper divisors (51434380439).

221287449745 is a wasteful number, since it uses less digits than its factorization.

221287449745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196148419.

The product of its digits is 9031680, while the sum is 55.

The spelling of 221287449745 in words is "two hundred twenty-one billion, two hundred eighty-seven million, four hundred forty-nine thousand, seven hundred forty-five".