135127221 has 16 divisors (see below), whose sum is σ = 189911040. Its totient is φ = 85227120.

The previous prime is 135127217. The next prime is 135127243. The reversal of 135127221 is 122721531.

It is not a de Polignac number, because 135127221 - 2² = 135127217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 135127191 and 135127200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135127121) 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, 62956 + ... + 65066.

It is an arithmetic number, because the mean of its divisors is an integer number (11869440).

Almost surely, 2^135127221 is an apocalyptic number.

It is an amenable number.

135127221 is a deficient number, since it is larger than the sum of its proper divisors (54783819).

135127221 is a wasteful number, since it uses less digits than its factorization.

135127221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256.

The product of its digits is 840, while the sum is 24.

The square root of 135127221 is about 11624.4234695747. The cubic root of 135127221 is about 513.1538777431.

Adding to 135127221 its reverse (122721531), we get a palindrome (257848752).

The spelling of 135127221 in words is "one hundred thirty-five million, one hundred twenty-seven thousand, two hundred twenty-one".