221452989 has 8 divisors (see below), whose sum is σ = 295359360. Its totient is φ = 147590976.

The previous prime is 221452963. The next prime is 221453003. The reversal of 221452989 is 989254122.

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 221452989 - 2⁹ = 221452477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221452989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221452909) 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, 3189 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (36919920).

Almost surely, 2^221452989 is an apocalyptic number.

It is an amenable number.

221452989 is a deficient number, since it is larger than the sum of its proper divisors (73906371).

221452989 is a wasteful number, since it uses less digits than its factorization.

221452989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22179.

The product of its digits is 103680, while the sum is 42.

The square root of 221452989 is about 14881.2966168946. The cubic root of 221452989 is about 605.0071615390.

The spelling of 221452989 in words is "two hundred twenty-one million, four hundred fifty-two thousand, nine hundred eighty-nine".