135121603124 has 6 divisors (see below), whose sum is σ = 236462805474. Its totient is φ = 67560801560.

The previous prime is 135121603093. The next prime is 135121603129. The reversal of 135121603124 is 421306121531.

It can be written as a sum of positive squares in only one way, i.e., 122127883024 + 12993720100 = 349468^2 + 113990^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135121603129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16890200387 + ... + 16890200394.

It is an arithmetic number, because the mean of its divisors is an integer number (39410467579).

Almost surely, 2^135121603124 is an apocalyptic number.

It is an amenable number.

135121603124 is a deficient number, since it is larger than the sum of its proper divisors (101341202350).

135121603124 is a wasteful number, since it uses less digits than its factorization.

135121603124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33780400785 (or 33780400783 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 135121603124 its reverse (421306121531), we get a palindrome (556427724655).

The spelling of 135121603124 in words is "one hundred thirty-five billion, one hundred twenty-one million, six hundred three thousand, one hundred twenty-four".