221452237 has 2 divisors, whose sum is σ = 221452238. Its totient is φ = 221452236.

The previous prime is 221452223. The next prime is 221452241. The reversal of 221452237 is 732254122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209265156 + 12187081 = 14466^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 221452237 - 2¹¹ = 221450189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221452267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110726118 + 110726119.

It is an arithmetic number, because the mean of its divisors is an integer number (110726119).

Almost surely, 2^221452237 is an apocalyptic number.

It is an amenable number.

221452237 is a deficient number, since it is larger than the sum of its proper divisors (1).

221452237 is an equidigital number, since it uses as much as digits as its factorization.

221452237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 28.

The square root of 221452237 is about 14881.2713502577. The cubic root of 221452237 is about 605.0064767196.

The spelling of 221452237 in words is "two hundred twenty-one million, four hundred fifty-two thousand, two hundred thirty-seven".