221248087 has 2 divisors, whose sum is σ = 221248088. Its totient is φ = 221248086.

The previous prime is 221248067. The next prime is 221248133. The reversal of 221248087 is 780842122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221248087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221248057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110624043 + 110624044.

It is an arithmetic number, because the mean of its divisors is an integer number (110624044).

Almost surely, 2^221248087 is an apocalyptic number.

221248087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221248087 is an equidigital number, since it uses as much as digits as its factorization.

221248087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 221248087 is about 14874.4104757130. The cubic root of 221248087 is about 604.8205072793.

The spelling of 221248087 in words is "two hundred twenty-one million, two hundred forty-eight thousand, eighty-seven".