135111421 has 2 divisors, whose sum is σ = 135111422. Its totient is φ = 135111420.

The previous prime is 135111313. The next prime is 135111433. The reversal of 135111421 is 124111531.

135111421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125686521 + 9424900 = 11211^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 135111421 - 2⁹ = 135110909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135111481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67555710 + 67555711.

It is an arithmetic number, because the mean of its divisors is an integer number (67555711).

Almost surely, 2^135111421 is an apocalyptic number.

It is an amenable number.

135111421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135111421 is an equidigital number, since it uses as much as digits as its factorization.

135111421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 19.

The square root of 135111421 is about 11623.7438461109. The cubic root of 135111421 is about 513.1338764751.

Adding to 135111421 its reverse (124111531), we get a palindrome (259222952).

It can be divided in two parts, 135 and 111421, that added together give a square (111556 = 334²).

The spelling of 135111421 in words is "one hundred thirty-five million, one hundred eleven thousand, four hundred twenty-one".