221564130 has 64 divisors (see below), whose sum is σ = 577843200. Its totient is φ = 54164160.

The previous prime is 221564117. The next prime is 221564159. The reversal of 221564130 is 31465122.

221564130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221564130.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11401 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (9028800).

Almost surely, 2^221564130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221564130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288921600).

221564130 is an abundant number, since it is smaller than the sum of its proper divisors (356279070).

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

221564130 is a wasteful number, since it uses less digits than its factorization.

221564130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12599.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 221564130 is about 14885.0303997002. The cubic root of 221564130 is about 605.1083566136.

The spelling of 221564130 in words is "two hundred twenty-one million, five hundred sixty-four thousand, one hundred thirty".