221140237 has 2 divisors, whose sum is σ = 221140238. Its totient is φ = 221140236.

The previous prime is 221140223. The next prime is 221140273. The reversal of 221140237 is 732041122.

221140237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (221140273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219899241 + 1240996 = 14829^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 221140237 - 2¹⁹ = 220615949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221140637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110570118 + 110570119.

It is an arithmetic number, because the mean of its divisors is an integer number (110570119).

Almost surely, 2^221140237 is an apocalyptic number.

It is an amenable number.

221140237 is a deficient number, since it is larger than the sum of its proper divisors (1).

221140237 is an equidigital number, since it uses as much as digits as its factorization.

221140237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221140237 is about 14870.7846800362. The cubic root of 221140237 is about 604.7222156670.

Adding to 221140237 its reverse (732041122), we get a palindrome (953181359).

The spelling of 221140237 in words is "two hundred twenty-one million, one hundred forty thousand, two hundred thirty-seven".