221859845 has 8 divisors (see below), whose sum is σ = 267703800. Its totient is φ = 176506560.

The previous prime is 221859829. The next prime is 221859851. The reversal of 221859845 is 548958122.

It can be written as a sum of positive squares in 4 ways, for example, as 21325924 + 200533921 = 4618^2 + 14161^2 .

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

It is not a de Polignac number, because 221859845 - 2⁴ = 221859829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221859796 and 221859805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121670 + ... + 123479.

It is an arithmetic number, because the mean of its divisors is an integer number (33462975).

Almost surely, 2^221859845 is an apocalyptic number.

It is an amenable number.

221859845 is a deficient number, since it is larger than the sum of its proper divisors (45843955).

221859845 is a wasteful number, since it uses less digits than its factorization.

221859845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245335.

The product of its digits is 230400, while the sum is 44.

The square root of 221859845 is about 14894.9603893397. The cubic root of 221859845 is about 605.3774435942.

The spelling of 221859845 in words is "two hundred twenty-one million, eight hundred fifty-nine thousand, eight hundred forty-five".