221200686 has 128 divisors (see below), whose sum is σ = 594739200. Its totient is φ = 59603040.

The previous prime is 221200673. The next prime is 221200723. The reversal of 221200686 is 686002122.

221200686 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 (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 503655 + ... + 504093.

It is an arithmetic number, because the mean of its divisors is an integer number (4646400).

Almost surely, 2^221200686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221200686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297369600).

221200686 is an abundant number, since it is smaller than the sum of its proper divisors (373538514).

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

221200686 is a wasteful number, since it uses less digits than its factorization.

221200686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 221200686 is about 14872.8170162885. The cubic root of 221200686 is about 604.7773112079. Note that the first 3 decimals are identical.

The spelling of 221200686 in words is "two hundred twenty-one million, two hundred thousand, six hundred eighty-six".