135020421 has 24 divisors (see below), whose sum is σ = 200753280. Its totient is φ = 87393600.

The previous prime is 135020393. The next prime is 135020429. The reversal of 135020421 is 124020531.

It is not a de Polignac number, because 135020421 - 2⁷ = 135020293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135020394 and 135020403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135020429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87426 + ... + 88956.

It is an arithmetic number, because the mean of its divisors is an integer number (8364720).

Almost surely, 2^135020421 is an apocalyptic number.

It is an amenable number.

135020421 is a deficient number, since it is larger than the sum of its proper divisors (65732859).

135020421 is a wasteful number, since it uses less digits than its factorization.

135020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 135020421 is about 11619.8287853135. The cubic root of 135020421 is about 513.0186489350.

Adding to 135020421 its reverse (124020531), we get a palindrome (259040952).

The spelling of 135020421 in words is "one hundred thirty-five million, twenty thousand, four hundred twenty-one".