221123320 has 32 divisors (see below), whose sum is σ = 542758320. Its totient is φ = 80408320.

The previous prime is 221123303. The next prime is 221123333. The reversal of 221123320 is 23321122.

221123320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221123294 and 221123303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250837 + ... + 251716.

Almost surely, 2^221123320 is an apocalyptic number.

221123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221123320 is an abundant number, since it is smaller than the sum of its proper divisors (321635000).

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

221123320 is a wasteful number, since it uses less digits than its factorization.

221123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502575 (or 502571 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221123320 is about 14870.2158693141. The cubic root of 221123320 is about 604.7067950652.

Adding to 221123320 its reverse (23321122), we get a palindrome (244444442).

The spelling of 221123320 in words is "two hundred twenty-one million, one hundred twenty-three thousand, three hundred twenty".