221222241 has 24 divisors (see below), whose sum is σ = 338911560. Its totient is φ = 138571776.

The previous prime is 221222213. The next prime is 221222249. The reversal of 221222241 is 142222122.

It can be written as a sum of positive squares in 4 ways, for example, as 74909025 + 146313216 = 8655^2 + 12096^2 .

It is not a de Polignac number, because 221222241 - 2²¹ = 219125089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153661 + ... + 155093.

It is an arithmetic number, because the mean of its divisors is an integer number (14121315).

Almost surely, 2^221222241 is an apocalyptic number.

It is an amenable number.

221222241 is a deficient number, since it is larger than the sum of its proper divisors (117689319).

221222241 is a wasteful number, since it uses less digits than its factorization.

221222241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 2462 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 221222241 is about 14873.5416427964. The cubic root of 221222241 is about 604.7969548353.

Adding to 221222241 its reverse (142222122), we get a palindrome (363444363).

The spelling of 221222241 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred forty-one".