135521420 has 24 divisors (see below), whose sum is σ = 284840304. Its totient is φ = 54161856.

The previous prime is 135521413. The next prime is 135521431. The reversal of 135521420 is 24125531.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29819 + ... + 34061.

It is an arithmetic number, because the mean of its divisors is an integer number (11868346).

Almost surely, 2^135521420 is an apocalyptic number.

135521420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135521420 is an abundant number, since it is smaller than the sum of its proper divisors (149318884).

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

135521420 is a wasteful number, since it uses less digits than its factorization.

135521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5849 (or 5847 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 135521420 is about 11641.3667582462. The cubic root of 135521420 is about 513.6523915573.

Adding to 135521420 its reverse (24125531), we get a palindrome (159646951).

The spelling of 135521420 in words is "one hundred thirty-five million, five hundred twenty-one thousand, four hundred twenty".