221939359 has 2 divisors, whose sum is σ = 221939360. Its totient is φ = 221939358.

The previous prime is 221939339. The next prime is 221939363. The reversal of 221939359 is 953939122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221939359 - 2¹⁹ = 221415071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221939329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110969679 + 110969680.

It is an arithmetic number, because the mean of its divisors is an integer number (110969680).

Almost surely, 2^221939359 is an apocalyptic number.

221939359 is a deficient number, since it is larger than the sum of its proper divisors (1).

221939359 is an equidigital number, since it uses as much as digits as its factorization.

221939359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 221939359 is about 14897.6293080476. The cubic root of 221939359 is about 605.4497568641.

The spelling of 221939359 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, three hundred fifty-nine".