1211330135 has 4 divisors (see below), whose sum is σ = 1453596168. Its totient is φ = 969064104.

The previous prime is 1211330129. The next prime is 1211330149. The reversal of 1211330135 is 5310331121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211330135 - 2¹⁰ = 1211329111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121133009 + ... + 121133018.

It is an arithmetic number, because the mean of its divisors is an integer number (363399042).

Almost surely, 2^1211330135 is an apocalyptic number.

1211330135 is a deficient number, since it is larger than the sum of its proper divisors (242266033).

1211330135 is an equidigital number, since it uses as much as digits as its factorization.

1211330135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242266032.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1211330135 is about 34804.1683566782. The cubic root of 1211330135 is about 1065.9925606714.

Adding to 1211330135 its reverse (5310331121), we get a palindrome (6521661256).

The spelling of 1211330135 in words is "one billion, two hundred eleven million, three hundred thirty thousand, one hundred thirty-five".