230820221 has 4 divisors (see below), whose sum is σ = 232369500. Its totient is φ = 229270944.

The previous prime is 230820217. The next prime is 230820229. The reversal of 230820221 is 122028032.

230820221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90516196 + 140304025 = 9514^2 + 11845^2 .

It is a cyclic number.

It is not a de Polignac number, because 230820221 - 2² = 230820217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 230820193 and 230820202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230820229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774416 + ... + 774713.

It is an arithmetic number, because the mean of its divisors is an integer number (58092375).

Almost surely, 2^230820221 is an apocalyptic number.

It is an amenable number.

230820221 is a deficient number, since it is larger than the sum of its proper divisors (1549279).

230820221 is a wasteful number, since it uses less digits than its factorization.

230820221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549278.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 230820221 is about 15192.7687075135. The cubic root of 230820221 is about 613.4200270951.

Adding to 230820221 its reverse (122028032), we get a palindrome (352848253).

The spelling of 230820221 in words is "two hundred thirty million, eight hundred twenty thousand, two hundred twenty-one".