221433020 has 24 divisors (see below), whose sum is σ = 465586800. Its totient is φ = 88463232.

The previous prime is 221433019. The next prime is 221433053. The reversal of 221433020 is 20334122.

It is a self number, because there is not a number n which added to its sum of digits gives 221433020.

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, 10736 + ... + 23624.

It is an arithmetic number, because the mean of its divisors is an integer number (19399450).

Almost surely, 2^221433020 is an apocalyptic number.

221433020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221433020 is an abundant number, since it is smaller than the sum of its proper divisors (244153780).

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

221433020 is a wasteful number, since it uses less digits than its factorization.

221433020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13757 (or 13755 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221433020 is about 14880.6256588895. The cubic root of 221433020 is about 604.9889759620.

Adding to 221433020 its reverse (20334122), we get a palindrome (241767142).

The spelling of 221433020 in words is "two hundred twenty-one million, four hundred thirty-three thousand, twenty".