135221420242231 has 2 divisors, whose sum is σ = 135221420242232. Its totient is φ = 135221420242230.

The previous prime is 135221420242219. The next prime is 135221420242261. The reversal of 135221420242231 is 132242024122531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135221420242231 - 2⁵ = 135221420242199 is a prime.

It is a super-2 number, since 2×135221420242231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135221420242261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67610710121115 + 67610710121116.

It is an arithmetic number, because the mean of its divisors is an integer number (67610710121116).

Almost surely, 2^{135221420242231} is an apocalyptic number.

135221420242231 is a deficient number, since it is larger than the sum of its proper divisors (1).

135221420242231 is an equidigital number, since it uses as much as digits as its factorization.

135221420242231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 135221420242231 its reverse (132242024122531), we get a palindrome (267463444364762).

The spelling of 135221420242231 in words is "one hundred thirty-five trillion, two hundred twenty-one billion, four hundred twenty million, two hundred forty-two thousand, two hundred thirty-one".