221148443 has 4 divisors (see below), whose sum is σ = 221221440. Its totient is φ = 221075448.

The previous prime is 221148419. The next prime is 221148491. The reversal of 221148443 is 344841122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344841122 = 2 ⋅172420561.

It is a cyclic number.

It is not a de Polignac number, because 221148443 - 2⁶ = 221148379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221148493) 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, 31748 + ... + 38081.

It is an arithmetic number, because the mean of its divisors is an integer number (55305360).

Almost surely, 2^221148443 is an apocalyptic number.

221148443 is a deficient number, since it is larger than the sum of its proper divisors (72997).

221148443 is an equidigital number, since it uses as much as digits as its factorization.

221148443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72996.

The product of its digits is 6144, while the sum is 29.

The square root of 221148443 is about 14871.0605875976. The cubic root of 221148443 is about 604.7296955196.

Adding to 221148443 its reverse (344841122), we get a palindrome (565989565).

The spelling of 221148443 in words is "two hundred twenty-one million, one hundred forty-eight thousand, four hundred forty-three".