221807620 has 12 divisors (see below), whose sum is σ = 465796044. Its totient is φ = 88723040.

The previous prime is 221807611. The next prime is 221807633. The reversal of 221807620 is 26708122.

221807620 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 109998144 + 111809476 = 10488^2 + 10574^2 .

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, 5545171 + ... + 5545210.

It is an arithmetic number, because the mean of its divisors is an integer number (38816337).

Almost surely, 2^221807620 is an apocalyptic number.

221807620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221807620 is an abundant number, since it is smaller than the sum of its proper divisors (243988424).

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

221807620 is a wasteful number, since it uses less digits than its factorization.

221807620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11090390 (or 11090388 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 221807620 is about 14893.2071764278. The cubic root of 221807620 is about 605.3299386509.

The spelling of 221807620 in words is "two hundred twenty-one million, eight hundred seven thousand, six hundred twenty".