221223460 has 24 divisors (see below), whose sum is σ = 489021120. Its totient is φ = 83831904.

The previous prime is 221223451. The next prime is 221223467. The reversal of 221223460 is 64322122.

221223460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221223467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290704 + ... + 291463.

It is an arithmetic number, because the mean of its divisors is an integer number (20375880).

Almost surely, 2^221223460 is an apocalyptic number.

221223460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221223460 is an abundant number, since it is smaller than the sum of its proper divisors (267797660).

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

221223460 is a wasteful number, since it uses less digits than its factorization.

221223460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582195 (or 582193 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 221223460 is about 14873.5826215475. The cubic root of 221223460 is about 604.7980657033.

Adding to 221223460 its reverse (64322122), we get a palindrome (285545582).

The spelling of 221223460 in words is "two hundred twenty-one million, two hundred twenty-three thousand, four hundred sixty".