135404421 has 4 divisors (see below), whose sum is σ = 180539232. Its totient is φ = 90269612.

The previous prime is 135404419. The next prime is 135404429. The reversal of 135404421 is 124404531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124404531 = 3 ⋅41468177.

It is a cyclic number.

It is not a de Polignac number, because 135404421 - 2¹ = 135404419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135404391 and 135404400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135404429) 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, 22567401 + ... + 22567406.

It is an arithmetic number, because the mean of its divisors is an integer number (45134808).

Almost surely, 2^135404421 is an apocalyptic number.

It is an amenable number.

135404421 is a deficient number, since it is larger than the sum of its proper divisors (45134811).

135404421 is an equidigital number, since it uses as much as digits as its factorization.

135404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45134810.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 135404421 is about 11636.3405330026. The cubic root of 135404421 is about 513.5045327199.

Adding to 135404421 its reverse (124404531), we get a palindrome (259808952).

The spelling of 135404421 in words is "one hundred thirty-five million, four hundred four thousand, four hundred twenty-one".