135440542234421 has 4 divisors (see below), whose sum is σ = 135940322833344. Its totient is φ = 134940761635500.

The previous prime is 135440542234379. The next prime is 135440542234433. The reversal of 135440542234421 is 124432245044531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135440542234421 - 2⁶ = 135440542234357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135440542134421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249890299055 + ... + 249890299596.

It is an arithmetic number, because the mean of its divisors is an integer number (33985080708336).

Almost surely, 2^{135440542234421} is an apocalyptic number.

It is an amenable number.

135440542234421 is a deficient number, since it is larger than the sum of its proper divisors (499780598923).

135440542234421 is an equidigital number, since it uses as much as digits as its factorization.

135440542234421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499780598922.

The product of its (nonzero) digits is 1843200, while the sum is 44.

Adding to 135440542234421 its reverse (124432245044531), we get a palindrome (259872787278952).

The spelling of 135440542234421 in words is "one hundred thirty-five trillion, four hundred forty billion, five hundred forty-two million, two hundred thirty-four thousand, four hundred twenty-one".