221484789 has 24 divisors (see below), whose sum is σ = 339737112. Its totient is φ = 138562560.

The previous prime is 221484773. The next prime is 221484833. The reversal of 221484789 is 987484122.

It can be written as a sum of positive squares in 4 ways, for example, as 76475025 + 145009764 = 8745^2 + 12042^2 .

It is not a de Polignac number, because 221484789 - 2⁴ = 221484773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221484709) 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 in 23 ways as a sum of consecutive naturals, for example, 55129 + ... + 59009.

It is an arithmetic number, because the mean of its divisors is an integer number (14155713).

Almost surely, 2^221484789 is an apocalyptic number.

It is an amenable number.

221484789 is a deficient number, since it is larger than the sum of its proper divisors (118252323).

221484789 is a wasteful number, since it uses less digits than its factorization.

221484789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277 (or 4274 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 221484789 is about 14882.3650338244. The cubic root of 221484789 is about 605.0361192379.

The spelling of 221484789 in words is "two hundred twenty-one million, four hundred eighty-four thousand, seven hundred eighty-nine".