135053221 has 6 divisors (see below), whose sum is σ = 138429266. Its totient is φ = 131757600.

The previous prime is 135053213. The next prime is 135053227. The reversal of 135053221 is 122350531.

135053221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 261121 + 134792100 = 511^2 + 11610^2 .

It is not a de Polignac number, because 135053221 - 2³ = 135053213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135053192 and 135053201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135053227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38490 + ... + 41851.

Almost surely, 2^135053221 is an apocalyptic number.

It is an amenable number.

135053221 is a deficient number, since it is larger than the sum of its proper divisors (3376045).

135053221 is an frugal number, since it uses more digits than its factorization.

135053221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80423 (or 80382 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 135053221 is about 11621.2400801291. The cubic root of 135053221 is about 513.0601874647.

The spelling of 135053221 in words is "one hundred thirty-five million, fifty-three thousand, two hundred twenty-one".