221300491 has 2 divisors, whose sum is σ = 221300492. Its totient is φ = 221300490.

The previous prime is 221300483. The next prime is 221300507. The reversal of 221300491 is 194003122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221300491 - 2³ = 221300483 is a prime.

It is not a weakly prime, because it can be changed into another prime (221300461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110650245 + 110650246.

It is an arithmetic number, because the mean of its divisors is an integer number (110650246).

Almost surely, 2^221300491 is an apocalyptic number.

221300491 is a deficient number, since it is larger than the sum of its proper divisors (1).

221300491 is an equidigital number, since it uses as much as digits as its factorization.

221300491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221300491 is about 14876.1719202219. The cubic root of 221300491 is about 604.8682553559.

The spelling of 221300491 in words is "two hundred twenty-one million, three hundred thousand, four hundred ninety-one".