221334320 has 20 divisors (see below), whose sum is σ = 514602480. Its totient is φ = 88533696.

The previous prime is 221334317. The next prime is 221334341. The reversal of 221334320 is 23433122.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221334292 and 221334301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383260 + ... + 1383419.

It is an arithmetic number, because the mean of its divisors is an integer number (25730124).

Almost surely, 2^221334320 is an apocalyptic number.

221334320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221334320 is an abundant number, since it is smaller than the sum of its proper divisors (293268160).

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

221334320 is a wasteful number, since it uses less digits than its factorization.

221334320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766692 (or 2766686 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 221334320 is about 14877.3088964369. The cubic root of 221334320 is about 604.8990747568.

Adding to 221334320 its reverse (23433122), we get a palindrome (244767442).

The spelling of 221334320 in words is "two hundred twenty-one million, three hundred thirty-four thousand, three hundred twenty".