240431231221 has 2 divisors, whose sum is σ = 240431231222. Its totient is φ = 240431231220.

The previous prime is 240431231179. The next prime is 240431231237. The reversal of 240431231221 is 122132134042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172734996996 + 67696234225 = 415614^2 + 260185^2 .

It is a cyclic number.

It is not a de Polignac number, because 240431231221 - 2⁹ = 240431230709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240431231281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120215615610 + 120215615611.

It is an arithmetic number, because the mean of its divisors is an integer number (120215615611).

Almost surely, 2^240431231221 is an apocalyptic number.

It is an amenable number.

240431231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

240431231221 is an equidigital number, since it uses as much as digits as its factorization.

240431231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 240431231221 its reverse (122132134042), we get a palindrome (362563365263).

The spelling of 240431231221 in words is "two hundred forty billion, four hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".