221996289 has 8 divisors (see below), whose sum is σ = 296485120. Its totient is φ = 147752496.

The previous prime is 221996287. The next prime is 221996329. The reversal of 221996289 is 982699122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221996289 - 2¹ = 221996287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221996287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59134 + ... + 62775.

It is an arithmetic number, because the mean of its divisors is an integer number (37060640).

Almost surely, 2^221996289 is an apocalyptic number.

It is an amenable number.

221996289 is a deficient number, since it is larger than the sum of its proper divisors (74488831).

221996289 is a wasteful number, since it uses less digits than its factorization.

221996289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122519.

The product of its digits is 279936, while the sum is 48.

The square root of 221996289 is about 14899.5398922249. The cubic root of 221996289 is about 605.5015207154.

The spelling of 221996289 in words is "two hundred twenty-one million, nine hundred ninety-six thousand, two hundred eighty-nine".