213134661 has 24 divisors (see below), whose sum is σ = 326536704. Its totient is φ = 133499520.

The previous prime is 213134657. The next prime is 213134683. The reversal of 213134661 is 166431312.

It is not a de Polignac number, because 213134661 - 2² = 213134657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213134161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144156 + ... + 145626.

It is an arithmetic number, because the mean of its divisors is an integer number (13605696).

Almost surely, 2^213134661 is an apocalyptic number.

It is an amenable number.

213134661 is a deficient number, since it is larger than the sum of its proper divisors (113402043).

213134661 is a wasteful number, since it uses less digits than its factorization.

213134661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441 (or 2438 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 213134661 is about 14599.1322002371. The cubic root of 213134661 is about 597.3350896113.

Adding to 213134661 its reverse (166431312), we get a palindrome (379565973).

The spelling of 213134661 in words is "two hundred thirteen million, one hundred thirty-four thousand, six hundred sixty-one".