352224221 has 4 divisors (see below), whose sum is σ = 353349852. Its totient is φ = 351098592.

The previous prime is 352224179. The next prime is 352224253. The reversal of 352224221 is 122422253.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119661721 + 232562500 = 10939^2 + 15250^2 .

It is a cyclic number.

It is not a de Polignac number, because 352224221 - 2¹⁴ = 352207837 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 (352229221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562346 + ... + 562971.

It is an arithmetic number, because the mean of its divisors is an integer number (88337463).

Almost surely, 2^352224221 is an apocalyptic number.

It is an amenable number.

352224221 is a deficient number, since it is larger than the sum of its proper divisors (1125631).

352224221 is a wasteful number, since it uses less digits than its factorization.

352224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125630.

The product of its digits is 1920, while the sum is 23.

The square root of 352224221 is about 18767.6375977372. The cubic root of 352224221 is about 706.2195553640.

Adding to 352224221 its reverse (122422253), we get a palindrome (474646474).

The spelling of 352224221 in words is "three hundred fifty-two million, two hundred twenty-four thousand, two hundred twenty-one".