221087 has 2 divisors, whose sum is σ = 221088. Its totient is φ = 221086.

The previous prime is 221083. The next prime is 221093. The reversal of 221087 is 780122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221087 - 2² = 221083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110543 + 110544.

It is an arithmetic number, because the mean of its divisors is an integer number (110544).

2²²¹⁰⁸⁷ is an apocalyptic number.

221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221087 is an equidigital number, since it uses as much as digits as its factorization.

221087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 221087 is about 470.1988940863. The cubic root of 221087 is about 60.4673685104.

The spelling of 221087 in words is "two hundred twenty-one thousand, eighty-seven".