221444120 has 16 divisors (see below), whose sum is σ = 498249360. Its totient is φ = 88577632.

The previous prime is 221444099. The next prime is 221444131. The reversal of 221444120 is 21444122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221444092 and 221444101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2768012 + ... + 2768091.

It is an arithmetic number, because the mean of its divisors is an integer number (31140585).

Almost surely, 2^221444120 is an apocalyptic number.

221444120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221444120 is an abundant number, since it is smaller than the sum of its proper divisors (276805240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221444120 is a wasteful number, since it uses less digits than its factorization.

221444120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536114 (or 5536110 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 221444120 is about 14880.9986224043. The cubic root of 221444120 is about 604.9990847606. Note that the first 3 decimals are identical.

Adding to 221444120 its reverse (21444122), we get a palindrome (242888242).

The spelling of 221444120 in words is "two hundred twenty-one million, four hundred forty-four thousand, one hundred twenty".