221689101 has 8 divisors (see below), whose sum is σ = 299634880. Its totient is φ = 145768032.

The previous prime is 221689081. The next prime is 221689133. The reversal of 221689101 is 101986122.

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 221689101 - 2¹³ = 221680909 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 (221689141) 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, 505921 + ... + 506358.

It is an arithmetic number, because the mean of its divisors is an integer number (37454360).

Almost surely, 2^221689101 is an apocalyptic number.

It is an amenable number.

221689101 is a deficient number, since it is larger than the sum of its proper divisors (77945779).

221689101 is a wasteful number, since it uses less digits than its factorization.

221689101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012355.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 221689101 is about 14889.2276831272. The cubic root of 221689101 is about 605.2221036405. Note that the first 3 decimals are identical.

The spelling of 221689101 in words is "two hundred twenty-one million, six hundred eighty-nine thousand, one hundred one".