221540027 has 2 divisors, whose sum is σ = 221540028. Its totient is φ = 221540026.

The previous prime is 221540021. The next prime is 221540047. The reversal of 221540027 is 720045122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221540027 - 2⁶ = 221539963 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221539984 and 221540011.

It is not a weakly prime, because it can be changed into another prime (221540021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770013 + 110770014.

It is an arithmetic number, because the mean of its divisors is an integer number (110770014).

Almost surely, 2^221540027 is an apocalyptic number.

221540027 is a deficient number, since it is larger than the sum of its proper divisors (1).

221540027 is an equidigital number, since it uses as much as digits as its factorization.

221540027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 221540027 is about 14884.2207387555. The cubic root of 221540027 is about 605.0864134474.

Adding to 221540027 its reverse (720045122), we get a palindrome (941585149).

The spelling of 221540027 in words is "two hundred twenty-one million, five hundred forty thousand, twenty-seven".