135221241 has 4 divisors (see below), whose sum is σ = 180294992. Its totient is φ = 90147492.

The previous prime is 135221231. The next prime is 135221243. The reversal of 135221241 is 142122531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 135221241 - 2¹³ = 135213049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135221243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536871 + ... + 22536876.

It is an arithmetic number, because the mean of its divisors is an integer number (45073748).

Almost surely, 2^135221241 is an apocalyptic number.

It is an amenable number.

135221241 is a deficient number, since it is larger than the sum of its proper divisors (45073751).

135221241 is an equidigital number, since it uses as much as digits as its factorization.

135221241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45073750.

The product of its digits is 480, while the sum is 21.

The square root of 135221241 is about 11628.4668378940. The cubic root of 135221241 is about 513.2728657154.

Adding to 135221241 its reverse (142122531), we get a palindrome (277343772).

The spelling of 135221241 in words is "one hundred thirty-five million, two hundred twenty-one thousand, two hundred forty-one".