221484689 has 2 divisors, whose sum is σ = 221484690. Its totient is φ = 221484688.

The previous prime is 221484671. The next prime is 221484709. The reversal of 221484689 is 986484122.

221484689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192238225 + 29246464 = 13865^2 + 5408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221484689 is a prime.

It is a super-3 number, since 3×221484689³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (221480689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110742344 + 110742345.

It is an arithmetic number, because the mean of its divisors is an integer number (110742345).

Almost surely, 2^221484689 is an apocalyptic number.

It is an amenable number.

221484689 is a deficient number, since it is larger than the sum of its proper divisors (1).

221484689 is an equidigital number, since it uses as much as digits as its factorization.

221484689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The square root of 221484689 is about 14882.3616741430. The cubic root of 221484689 is about 605.0360281803.

The spelling of 221484689 in words is "two hundred twenty-one million, four hundred eighty-four thousand, six hundred eighty-nine".