221204489 has 8 divisors (see below), whose sum is σ = 249635520. Its totient is φ = 194160400.

The previous prime is 221204429. The next prime is 221204497. The reversal of 221204489 is 984402122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221204489 - 2⁸ = 221204233 is a prime.

It is a super-2 number, since 2×221204489² = 97862851907502242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221204429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346397 + ... + 347034.

It is an arithmetic number, because the mean of its divisors is an integer number (31204440).

Almost surely, 2^221204489 is an apocalyptic number.

221204489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

221204489 is a deficient number, since it is larger than the sum of its proper divisors (28431031).

221204489 is a wasteful number, since it uses less digits than its factorization.

221204489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693471.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 221204489 is about 14872.9448664345. The cubic root of 221204489 is about 604.7807770726.

The spelling of 221204489 in words is "two hundred twenty-one million, two hundred four thousand, four hundred eighty-nine".