221024387 has 2 divisors, whose sum is σ = 221024388. Its totient is φ = 221024386.

The previous prime is 221024381. The next prime is 221024413. The reversal of 221024387 is 783420122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221024387 - 2¹⁶ = 220958851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221024381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110512193 + 110512194.

It is an arithmetic number, because the mean of its divisors is an integer number (110512194).

Almost surely, 2^221024387 is an apocalyptic number.

221024387 is a deficient number, since it is larger than the sum of its proper divisors (1).

221024387 is an equidigital number, since it uses as much as digits as its factorization.

221024387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 221024387 is about 14866.8889482635. Note that the first 3 decimals coincide. The cubic root of 221024387 is about 604.6165974600.

The spelling of 221024387 in words is "two hundred twenty-one million, twenty-four thousand, three hundred eighty-seven".