221450289 has 4 divisors (see below), whose sum is σ = 295267056. Its totient is φ = 147633524.

The previous prime is 221450287. The next prime is 221450297. The reversal of 221450289 is 982054122.

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 221450289 - 2¹ = 221450287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221450287) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36908379 + ... + 36908384.

It is an arithmetic number, because the mean of its divisors is an integer number (73816764).

Almost surely, 2^221450289 is an apocalyptic number.

It is an amenable number.

221450289 is a deficient number, since it is larger than the sum of its proper divisors (73816767).

221450289 is an equidigital number, since it uses as much as digits as its factorization.

221450289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73816766.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 221450289 is about 14881.2058987167. The cubic root of 221450289 is about 605.0047027388.

The spelling of 221450289 in words is "two hundred twenty-one million, four hundred fifty thousand, two hundred eighty-nine".