221410221 has 8 divisors (see below), whose sum is σ = 297369024. Its totient is φ = 146529120.

The previous prime is 221410207. The next prime is 221410223. The reversal of 221410221 is 122014122.

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

It is not a de Polignac number, because 221410221 - 2⁷ = 221410093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221410221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221410223) 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, 268945 + ... + 269766.

It is an arithmetic number, because the mean of its divisors is an integer number (37171128).

Almost surely, 2^221410221 is an apocalyptic number.

It is an amenable number.

221410221 is a deficient number, since it is larger than the sum of its proper divisors (75958803).

221410221 is a wasteful number, since it uses less digits than its factorization.

221410221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538851.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 221410221 is about 14879.8595759503. The cubic root of 221410221 is about 604.9682117943.

Adding to 221410221 its reverse (122014122), we get a palindrome (343424343).

The spelling of 221410221 in words is "two hundred twenty-one million, four hundred ten thousand, two hundred twenty-one".