221466520 has 64 divisors (see below), whose sum is σ = 549309600. Its totient is φ = 79687680.

The previous prime is 221466499. The next prime is 221466523. The reversal of 221466520 is 25664122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221466523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40086 + ... + 45274.

Almost surely, 2^221466520 is an apocalyptic number.

221466520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221466520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274654800).

221466520 is an abundant number, since it is smaller than the sum of its proper divisors (327843080).

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

221466520 is a wasteful number, since it uses less digits than its factorization.

221466520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308 (or 5304 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 221466520 is about 14881.7512410334. The cubic root of 221466520 is about 605.0194834697.

The spelling of 221466520 in words is "two hundred twenty-one million, four hundred sixty-six thousand, five hundred twenty".