221484979 has 2 divisors, whose sum is σ = 221484980. Its totient is φ = 221484978.

The previous prime is 221484943. The next prime is 221484983. The reversal of 221484979 is 979484122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221484979 - 2⁹ = 221484467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221484079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110742489 + 110742490.

It is an arithmetic number, because the mean of its divisors is an integer number (110742490).

Almost surely, 2^221484979 is an apocalyptic number.

221484979 is a deficient number, since it is larger than the sum of its proper divisors (1).

221484979 is an equidigital number, since it uses as much as digits as its factorization.

221484979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 221484979 is about 14882.3714172171. The cubic root of 221484979 is about 605.0362922472.

The spelling of 221484979 in words is "two hundred twenty-one million, four hundred eighty-four thousand, nine hundred seventy-nine".