221552422220443 has 4 divisors (see below), whose sum is σ = 221621291487640. Its totient is φ = 221483552953248.

The previous prime is 221552422220431. The next prime is 221552422220477. The reversal of 221552422220443 is 344022224255122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221552422220443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221552422220396 and 221552422220405.

It is not an unprimeable number, because it can be changed into a prime (221552422224443) 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, 34434628773 + ... + 34434635206.

It is an arithmetic number, because the mean of its divisors is an integer number (55405322871910).

Almost surely, 2^{221552422220443} is an apocalyptic number.

221552422220443 is a deficient number, since it is larger than the sum of its proper divisors (68869267197).

221552422220443 is an equidigital number, since it uses as much as digits as its factorization.

221552422220443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68869267196.

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 221552422220443 its reverse (344022224255122), we get a palindrome (565574646475565).

The spelling of 221552422220443 in words is "two hundred twenty-one trillion, five hundred fifty-two billion, four hundred twenty-two million, two hundred twenty thousand, four hundred forty-three".