221441237 has 2 divisors, whose sum is σ = 221441238. Its totient is φ = 221441236.

The previous prime is 221441197. The next prime is 221441377. The reversal of 221441237 is 732144122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139972561 + 81468676 = 11831^2 + 9026^2 .

It is a cyclic number.

It is not a de Polignac number, because 221441237 - 2⁸ = 221440981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221441537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720618 + 110720619.

It is an arithmetic number, because the mean of its divisors is an integer number (110720619).

Almost surely, 2^221441237 is an apocalyptic number.

It is an amenable number.

221441237 is a deficient number, since it is larger than the sum of its proper divisors (1).

221441237 is an equidigital number, since it uses as much as digits as its factorization.

221441237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 221441237 is about 14880.9017535901. The cubic root of 221441237 is about 604.9964592375.

Adding to 221441237 its reverse (732144122), we get a palindrome (953585359).

The spelling of 221441237 in words is "two hundred twenty-one million, four hundred forty-one thousand, two hundred thirty-seven".