221984229 has 4 divisors (see below), whose sum is σ = 295978976. Its totient is φ = 147989484.

The previous prime is 221984227. The next prime is 221984237. The reversal of 221984229 is 922489122.

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 not a de Polignac number, because 221984229 - 2¹ = 221984227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221984227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36997369 + ... + 36997374.

It is an arithmetic number, because the mean of its divisors is an integer number (73994744).

Almost surely, 2^221984229 is an apocalyptic number.

It is an amenable number.

221984229 is a deficient number, since it is larger than the sum of its proper divisors (73994747).

221984229 is an equidigital number, since it uses as much as digits as its factorization.

221984229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73994746.

The product of its digits is 41472, while the sum is 39.

The square root of 221984229 is about 14899.1351762443. The cubic root of 221984229 is about 605.4905558466.

The spelling of 221984229 in words is "two hundred twenty-one million, nine hundred eighty-four thousand, two hundred twenty-nine".