221841320847 has 32 divisors (see below), whose sum is σ = 302218656768. Its totient is φ = 144695556096.

The previous prime is 221841320839. The next prime is 221841320863. The reversal of 221841320847 is 748023148122.

It is not a de Polignac number, because 221841320847 - 2³ = 221841320839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221841320799 and 221841320808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221841321847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143771958 + ... + 143773500.

It is an arithmetic number, because the mean of its divisors is an integer number (9444333024).

Almost surely, 2^221841320847 is an apocalyptic number.

221841320847 is a deficient number, since it is larger than the sum of its proper divisors (80377335921).

221841320847 is a wasteful number, since it uses less digits than its factorization.

221841320847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559.

The product of its (nonzero) digits is 172032, while the sum is 42.

Adding to 221841320847 its reverse (748023148122), we get a palindrome (969864468969).

The spelling of 221841320847 in words is "two hundred twenty-one billion, eight hundred forty-one million, three hundred twenty thousand, eight hundred forty-seven".