230021221 has 2 divisors, whose sum is σ = 230021222. Its totient is φ = 230021220.

The previous prime is 230021213. The next prime is 230021227. The reversal of 230021221 is 122120032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225420196 + 4601025 = 15014^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 230021221 - 2³ = 230021213 is a prime.

It is a super-2 number, since 2×230021221² = 105819524220661682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230021227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115010610 + 115010611.

It is an arithmetic number, because the mean of its divisors is an integer number (115010611).

Almost surely, 2^230021221 is an apocalyptic number.

It is an amenable number.

230021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

230021221 is an equidigital number, since it uses as much as digits as its factorization.

230021221 is an evil number, because the sum of its binary digits is even.

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

The square root of 230021221 is about 15166.4505076171. The cubic root of 230021221 is about 612.7114103477.

Adding to 230021221 its reverse (122120032), we get a palindrome (352141253).

The spelling of 230021221 in words is "two hundred thirty million, twenty-one thousand, two hundred twenty-one".