230221021 has 4 divisors (see below), whose sum is σ = 243763452. Its totient is φ = 216678592.

The previous prime is 230220877. The next prime is 230221031. The reversal of 230221021 is 120122032.

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 70324996 + 159896025 = 8386^2 + 12645^2 .

It is a cyclic number.

It is not a de Polignac number, because 230221021 - 2¹¹ = 230218973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 230220992 and 230221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (230221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6771190 + ... + 6771223.

It is an arithmetic number, because the mean of its divisors is an integer number (60940863).

Almost surely, 2^230221021 is an apocalyptic number.

It is an amenable number.

230221021 is a deficient number, since it is larger than the sum of its proper divisors (13542431).

230221021 is a wasteful number, since it uses less digits than its factorization.

230221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13542430.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 230221021 is about 15173.0359849306. The cubic root of 230221021 is about 612.8887625518. Note that the first 3 decimals are identical.

Adding to 230221021 its reverse (120122032), we get a palindrome (350343053).

The spelling of 230221021 in words is "two hundred thirty million, two hundred twenty-one thousand, twenty-one".