31230230221 has 2 divisors, whose sum is σ = 31230230222. Its totient is φ = 31230230220.

The previous prime is 31230230203. The next prime is 31230230237. The reversal of 31230230221 is 12203203213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25604480196 + 5625750025 = 160014^2 + 75005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31230230221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31230234221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615115110 + 15615115111.

It is an arithmetic number, because the mean of its divisors is an integer number (15615115111).

Almost surely, 2^31230230221 is an apocalyptic number.

It is an amenable number.

31230230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230230221 is an equidigital number, since it uses as much as digits as its factorization.

31230230221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31230230221 its reverse (12203203213), we get a palindrome (43433433434).

The spelling of 31230230221 in words is "thirty-one billion, two hundred thirty million, two hundred thirty thousand, two hundred twenty-one".