1213204135 has 32 divisors (see below), whose sum is σ = 1716244992. Its totient is φ = 811658880.

The previous prime is 1213204061. The next prime is 1213204141. The reversal of 1213204135 is 5314023121.

It is a happy number.

It is not a de Polignac number, because 1213204135 - 2¹⁵ = 1213171367 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216742 + ... + 222268.

It is an arithmetic number, because the mean of its divisors is an integer number (53632656).

Almost surely, 2^1213204135 is an apocalyptic number.

1213204135 is a deficient number, since it is larger than the sum of its proper divisors (503040857).

1213204135 is a wasteful number, since it uses less digits than its factorization.

1213204135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1213204135 is about 34831.0800148373. The cubic root of 1213204135 is about 1066.5419954660.

Adding to 1213204135 its reverse (5314023121), we get a palindrome (6527227256).

The spelling of 1213204135 in words is "one billion, two hundred thirteen million, two hundred four thousand, one hundred thirty-five".