135243121444 has 24 divisors (see below), whose sum is σ = 252279430200. Its totient is φ = 63216677376.

The previous prime is 135243121423. The next prime is 135243121451. The reversal of 135243121444 is 444121342531.

It can be written as a sum of positive squares in 4 ways, for example, as 964847844 + 134278273600 = 31062^2 + 366440^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6663927 + ... + 6684190.

It is an arithmetic number, because the mean of its divisors is an integer number (10511642925).

Almost surely, 2^135243121444 is an apocalyptic number.

It is an amenable number.

135243121444 is a deficient number, since it is larger than the sum of its proper divisors (117036308756).

135243121444 is a wasteful number, since it uses less digits than its factorization.

135243121444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13348287 (or 13348285 counting only the distinct ones).

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

Adding to 135243121444 its reverse (444121342531), we get a palindrome (579364463975).

The spelling of 135243121444 in words is "one hundred thirty-five billion, two hundred forty-three million, one hundred twenty-one thousand, four hundred forty-four".