221163520 has 52 divisors (see below), whose sum is σ = 530776800. Its totient is φ = 88457216.

The previous prime is 221163511. The next prime is 221163521. The reversal of 221163520 is 25361122.

It is a junction number, because it is equal to n+sod(n) for n = 221163491 and 221163500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221163521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15081 + ... + 25879.

Almost surely, 2^221163520 is an apocalyptic number.

221163520 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 221163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265388400).

221163520 is an abundant number, since it is smaller than the sum of its proper divisors (309613280).

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

221163520 is an equidigital number, since it uses as much as digits as its factorization.

221163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10828 (or 10806 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 221163520 is about 14871.5675031249. The cubic root of 221163520 is about 604.7434378764.

The spelling of 221163520 in words is "two hundred twenty-one million, one hundred sixty-three thousand, five hundred twenty".