213135406 has 16 divisors (see below), whose sum is σ = 349013808. Its totient is φ = 96811200.

The previous prime is 213135401. The next prime is 213135431. The reversal of 213135406 is 604531312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213135401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41416 + ... + 46276.

It is an arithmetic number, because the mean of its divisors is an integer number (21813363).

Almost surely, 2^213135406 is an apocalyptic number.

213135406 is a deficient number, since it is larger than the sum of its proper divisors (135878402).

213135406 is a wasteful number, since it uses less digits than its factorization.

213135406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6867.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 213135406 is about 14599.1577154300. The cubic root of 213135406 is about 597.3357855941.

Adding to 213135406 its reverse (604531312), we get a palindrome (817666718).

The spelling of 213135406 in words is "two hundred thirteen million, one hundred thirty-five thousand, four hundred six".