221150287 has 2 divisors, whose sum is σ = 221150288. Its totient is φ = 221150286.

The previous prime is 221150273. The next prime is 221150323. The reversal of 221150287 is 782051122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221150287 - 2⁷ = 221150159 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 (221150207) 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, 110575143 + 110575144.

It is an arithmetic number, because the mean of its divisors is an integer number (110575144).

Almost surely, 2^221150287 is an apocalyptic number.

221150287 is a deficient number, since it is larger than the sum of its proper divisors (1).

221150287 is an equidigital number, since it uses as much as digits as its factorization.

221150287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 221150287 is about 14871.1225870813. The cubic root of 221150287 is about 604.7313763189.

The spelling of 221150287 in words is "two hundred twenty-one million, one hundred fifty thousand, two hundred eighty-seven".