213135405 has 32 divisors (see below), whose sum is σ = 390791424. Its totient is φ = 97168896.

The previous prime is 213135401. The next prime is 213135431. The reversal of 213135405 is 504531312.

It is not a de Polignac number, because 213135405 - 2² = 213135401 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 39129 + ... + 44241.

It is an arithmetic number, because the mean of its divisors is an integer number (12212232).

Almost surely, 2^213135405 is an apocalyptic number.

It is an amenable number.

213135405 is a deficient number, since it is larger than the sum of its proper divisors (177656019).

213135405 is a wasteful number, since it uses less digits than its factorization.

213135405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 213135405 is about 14599.1576811815. The cubic root of 213135405 is about 597.3357846598.

Adding to 213135405 its reverse (504531312), we get a palindrome (717666717).

The spelling of 213135405 in words is "two hundred thirteen million, one hundred thirty-five thousand, four hundred five".