221066010 has 160 divisors (see below), whose sum is σ = 664690752. Its totient is φ = 52254720.

The previous prime is 221065997. The next prime is 221066029. The reversal of 221066010 is 10660122.

It is a happy number.

221066010 is a `hidden beast` number, since 2 + 2 + 1 + 0 + 660 + 1 + 0 = 666.

221066010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 382842 + ... + 383418.

Almost surely, 2^221066010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221066010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332345376).

221066010 is an abundant number, since it is smaller than the sum of its proper divisors (443624742).

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

221066010 is a wasteful number, since it uses less digits than its factorization.

221066010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221066010 is about 14868.2887381164. The cubic root of 221066010 is about 604.6545485920.

It can be divided in two parts, 2 and 21066010, that added together give a palindrome (21066012).

The spelling of 221066010 in words is "two hundred twenty-one million, sixty-six thousand, ten".