221554164 has 48 divisors (see below), whose sum is σ = 560205632. Its totient is φ = 67744512.

The previous prime is 221554159. The next prime is 221554181. The reversal of 221554164 is 461455122.

It is a congruent number.

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, 21072 + ... + 29784.

Almost surely, 2^221554164 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 221554164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280102816).

221554164 is an abundant number, since it is smaller than the sum of its proper divisors (338651468).

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

221554164 is a wasteful number, since it uses less digits than its factorization.

221554164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8896 (or 8894 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 221554164 is about 14884.6956300759. The cubic root of 221554164 is about 605.0992838450.

The spelling of 221554164 in words is "two hundred twenty-one million, five hundred fifty-four thousand, one hundred sixty-four".