221006064 has 20 divisors (see below), whose sum is σ = 570932456. Its totient is φ = 73668672.

The previous prime is 221006059. The next prime is 221006077. The reversal of 221006064 is 460600122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221006064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302099 + ... + 2302194.

Almost surely, 2^221006064 is an apocalyptic number.

221006064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221006064 is an abundant number, since it is smaller than the sum of its proper divisors (349926392).

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

221006064 is a wasteful number, since it uses less digits than its factorization.

221006064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604304 (or 4604298 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 221006064 is about 14866.2727003106. The cubic root of 221006064 is about 604.5998893549.

Adding to 221006064 its reverse (460600122), we get a palindrome (681606186).

The spelling of 221006064 in words is "two hundred twenty-one million, six thousand, sixty-four".