135051221 has 16 divisors (see below), whose sum is σ = 150735360. Its totient is φ = 120450240.

The previous prime is 135051197. The next prime is 135051223. The reversal of 135051221 is 122150531.

It is a happy number.

135051221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 135051221 - 2⁶ = 135051157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135051193 and 135051202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135051223) 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, 18695 + ... + 24891.

It is an arithmetic number, because the mean of its divisors is an integer number (9420960).

Almost surely, 2^135051221 is an apocalyptic number.

It is an amenable number.

135051221 is a deficient number, since it is larger than the sum of its proper divisors (15684139).

135051221 is a wasteful number, since it uses less digits than its factorization.

135051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6284.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 135051221 is about 11621.1540304739. The cubic root of 135051221 is about 513.0576548201.

The spelling of 135051221 in words is "one hundred thirty-five million, fifty-one thousand, two hundred twenty-one".