221032164 has 48 divisors (see below), whose sum is σ = 557722368. Its totient is φ = 67865088.

The previous prime is 221032153. The next prime is 221032177. The reversal of 221032164 is 461230122.

It is a self number, because there is not a number n which added to its sum of digits gives 221032164.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1939 + ... + 21114.

It is an arithmetic number, because the mean of its divisors is an integer number (11619216).

Almost surely, 2^221032164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221032164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278861184).

221032164 is an abundant number, since it is smaller than the sum of its proper divisors (336690204).

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

221032164 is a wasteful number, since it uses less digits than its factorization.

221032164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23124 (or 23122 counting only the distinct ones).

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

The square root of 221032164 is about 14867.1505003481. The cubic root of 221032164 is about 604.6236887561.

Adding to 221032164 its reverse (461230122), we get a palindrome (682262286).

The spelling of 221032164 in words is "two hundred twenty-one million, thirty-two thousand, one hundred sixty-four".