213431011 has 4 divisors (see below), whose sum is σ = 213560712. Its totient is φ = 213301312.

The previous prime is 213431003. The next prime is 213431017. The reversal of 213431011 is 110134312.

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 213431011 - 2³ = 213431003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213431017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62350 + ... + 65683.

It is an arithmetic number, because the mean of its divisors is an integer number (53390178).

Almost surely, 2^213431011 is an apocalyptic number.

213431011 is a deficient number, since it is larger than the sum of its proper divisors (129701).

213431011 is a wasteful number, since it uses less digits than its factorization.

213431011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129700.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 213431011 is about 14609.2782504818. The cubic root of 213431011 is about 597.6118133677.

Adding to 213431011 its reverse (110134312), we get a palindrome (323565323).

The spelling of 213431011 in words is "two hundred thirteen million, four hundred thirty-one thousand, eleven".