135121420 has 48 divisors (see below), whose sum is σ = 330926400. Its totient is φ = 46324992.

The previous prime is 135121417. The next prime is 135121429. The reversal of 135121420 is 24121531.

It is a super-3 number, since 3×135121420³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (135121429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2989 + ... + 16708.

It is an arithmetic number, because the mean of its divisors is an integer number (6894300).

Almost surely, 2^135121420 is an apocalyptic number.

135121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135121420 is an abundant number, since it is smaller than the sum of its proper divisors (195804980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135121420 is a wasteful number, since it uses less digits than its factorization.

135121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19727 (or 19711 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 135121420 is about 11624.1739491458. The cubic root of 135121420 is about 513.1465344208.

Adding to 135121420 its reverse (24121531), we get a palindrome (159242951).

The spelling of 135121420 in words is "one hundred thirty-five million, one hundred twenty-one thousand, four hundred twenty".