221130476845 has 4 divisors (see below), whose sum is σ = 265356572220. Its totient is φ = 176904381472.

The previous prime is 221130476843. The next prime is 221130476851. The reversal of 221130476845 is 548674031122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83968391529 + 137162085316 = 289773^2 + 370354^2 .

It is a cyclic number.

It is not a de Polignac number, because 221130476845 - 2¹ = 221130476843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221130476843) 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, 22113047680 + ... + 22113047689.

It is an arithmetic number, because the mean of its divisors is an integer number (66339143055).

Almost surely, 2^221130476845 is an apocalyptic number.

It is an amenable number.

221130476845 is a deficient number, since it is larger than the sum of its proper divisors (44226095375).

221130476845 is an equidigital number, since it uses as much as digits as its factorization.

221130476845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44226095374.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 221130476845 in words is "two hundred twenty-one billion, one hundred thirty million, four hundred seventy-six thousand, eight hundred forty-five".