221444064 has 48 divisors (see below), whose sum is σ = 645881040. Its totient is φ = 73814400.

The previous prime is 221444039. The next prime is 221444071. The reversal of 221444064 is 460444122.

It is a happy number.

221444064 is a `hidden beast` number, since 2 + 214 + 440 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127287 + ... + 129014.

It is an arithmetic number, because the mean of its divisors is an integer number (13455855).

Almost surely, 2^221444064 is an apocalyptic number.

221444064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221444064 is an abundant number, since it is smaller than the sum of its proper divisors (424436976).

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

221444064 is a wasteful number, since it uses less digits than its factorization.

221444064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256320 (or 256306 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 221444064 is about 14880.9967408101. The cubic root of 221444064 is about 604.9990337621. Note that the first 3 decimals are identical.

Adding to 221444064 its reverse (460444122), we get a palindrome (681888186).

The spelling of 221444064 in words is "two hundred twenty-one million, four hundred forty-four thousand, sixty-four".