221244401 has 4 divisors (see below), whose sum is σ = 252850752. Its totient is φ = 189638052.

The previous prime is 221244347. The next prime is 221244421. The reversal of 221244401 is 104442122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221244401 - 2¹⁰ = 221243377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221244421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15803165 + ... + 15803178.

It is an arithmetic number, because the mean of its divisors is an integer number (63212688).

Almost surely, 2^221244401 is an apocalyptic number.

It is an amenable number.

221244401 is a deficient number, since it is larger than the sum of its proper divisors (31606351).

221244401 is an equidigital number, since it uses as much as digits as its factorization.

221244401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31606350.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221244401 is about 14874.2865711267. The cubic root of 221244401 is about 604.8171484846.

Adding to 221244401 its reverse (104442122), we get a palindrome (325686523).

The spelling of 221244401 in words is "two hundred twenty-one million, two hundred forty-four thousand, four hundred one".