135061221 has 16 divisors (see below), whose sum is σ = 191913984. Its totient is φ = 84291504.

The previous prime is 135061219. The next prime is 135061229. The reversal of 135061221 is 122160531.

135061221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135061221 - 2¹ = 135061219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135061229) 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, 17581 + ... + 24066.

It is an arithmetic number, because the mean of its divisors is an integer number (11994624).

Almost surely, 2^135061221 is an apocalyptic number.

It is an amenable number.

135061221 is a deficient number, since it is larger than the sum of its proper divisors (56852763).

135061221 is a wasteful number, since it uses less digits than its factorization.

135061221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41720.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 135061221 is about 11621.5842723787. The cubic root of 135061221 is about 513.0703177932.

The spelling of 135061221 in words is "one hundred thirty-five million, sixty-one thousand, two hundred twenty-one".