229221720 has 192 divisors, whose sum is σ = 917017920. Its totient is φ = 48356352.

The previous prime is 229221689. The next prime is 229221721. The reversal of 229221720 is 27122922.

229221720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229221721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29262 + ... + 36258.

It is an arithmetic number, because the mean of its divisors is an integer number (4776135).

Almost surely, 2^229221720 is an apocalyptic number.

229221720 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 229221720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458508960).

229221720 is an abundant number, since it is smaller than the sum of its proper divisors (687796200).

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

229221720 is a wasteful number, since it uses less digits than its factorization.

229221720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034 (or 7027 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 229221720 is about 15140.0700130482. The cubic root of 229221720 is about 612.0007048563. Note that the first 3 decimals are identical.

It can be divided in two parts, 22922 and 1720, that added together give a palindrome (24642).

The spelling of 229221720 in words is "two hundred twenty-nine million, two hundred twenty-one thousand, seven hundred twenty".