221505441 has 8 divisors (see below), whose sum is σ = 295861920. Its totient is φ = 147409632.

The previous prime is 221505437. The next prime is 221505443. The reversal of 221505441 is 144505122.

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

It is not a de Polignac number, because 221505441 - 2² = 221505437 is a prime.

It is a super-3 number, since 3×221505441³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221505443) 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, 63175 + ... + 66588.

It is an arithmetic number, because the mean of its divisors is an integer number (36982740).

Almost surely, 2^221505441 is an apocalyptic number.

It is an amenable number.

221505441 is a deficient number, since it is larger than the sum of its proper divisors (74356479).

221505441 is a wasteful number, since it uses less digits than its factorization.

221505441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130335.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 221505441 is about 14883.0588589846. The cubic root of 221505441 is about 605.0549238664.

The spelling of 221505441 in words is "two hundred twenty-one million, five hundred five thousand, four hundred forty-one".