221909241 has 8 divisors (see below), whose sum is σ = 295950304. Its totient is φ = 147903840.

The previous prime is 221909213. The next prime is 221909243. The reversal of 221909241 is 142909122.

It is a happy number.

221909241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221909241 - 2⁵ = 221909209 is a prime.

It is a super-2 number, since 2×221909241² = 98487422482392162, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221909199 and 221909208.

It is not an unprimeable number, because it can be changed into a prime (221909243) 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, 14085 + ... + 25341.

It is an arithmetic number, because the mean of its divisors is an integer number (36993788).

Almost surely, 2^221909241 is an apocalyptic number.

It is an amenable number.

221909241 is a deficient number, since it is larger than the sum of its proper divisors (74041063).

221909241 is a wasteful number, since it uses less digits than its factorization.

221909241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17831.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 221909241 is about 14896.6184417807. The cubic root of 221909241 is about 605.4223683607.

The spelling of 221909241 in words is "two hundred twenty-one million, nine hundred nine thousand, two hundred forty-one".