221336020 has 24 divisors (see below), whose sum is σ = 466810344. Its totient is φ = 88152576.

The previous prime is 221335991. The next prime is 221336023. The reversal of 221336020 is 20633122.

It can be written as a sum of positive squares in 4 ways, for example, as 37136836 + 184199184 = 6094^2 + 13572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221336023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19089 + ... + 28408.

It is an arithmetic number, because the mean of its divisors is an integer number (19450431).

Almost surely, 2^221336020 is an apocalyptic number.

221336020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221336020 is an abundant number, since it is smaller than the sum of its proper divisors (245474324).

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

221336020 is a wasteful number, since it uses less digits than its factorization.

221336020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47739 (or 47737 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 221336020 is about 14877.3660303160. The cubic root of 221336020 is about 604.9006234334.

Adding to 221336020 its reverse (20633122), we get a palindrome (241969142).

The spelling of 221336020 in words is "two hundred twenty-one million, three hundred thirty-six thousand, twenty".