135836221 has 4 divisors (see below), whose sum is σ = 136813600. Its totient is φ = 134858844.

The previous prime is 135836201. The next prime is 135836227. The reversal of 135836221 is 122638531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122638531 = 2729 ⋅44939.

It is a cyclic number.

It is not a de Polignac number, because 135836221 - 2⁵ = 135836189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135836227) 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, 488481 + ... + 488758.

It is an arithmetic number, because the mean of its divisors is an integer number (34203400).

Almost surely, 2^135836221 is an apocalyptic number.

It is an amenable number.

135836221 is a deficient number, since it is larger than the sum of its proper divisors (977379).

135836221 is an equidigital number, since it uses as much as digits as its factorization.

135836221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977378.

The product of its digits is 8640, while the sum is 31.

The square root of 135836221 is about 11654.8797076589. The cubic root of 135836221 is about 514.0498028928.

The spelling of 135836221 in words is "one hundred thirty-five million, eight hundred thirty-six thousand, two hundred twenty-one".