213232109 has 6 divisors (see below), whose sum is σ = 215491626. Its totient is φ = 210975600.

The previous prime is 213232067. The next prime is 213232127. The reversal of 213232109 is 901232312.

It can be written as a sum of positive squares in 3 ways, for example, as 199430884 + 13801225 = 14122^2 + 3715^2 .

It is a de Polignac number, because none of the positive numbers 2^k-213232109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213232009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146027 + ... + 147479.

It is an arithmetic number, because the mean of its divisors is an integer number (35915271).

Almost surely, 2^213232109 is an apocalyptic number.

It is an amenable number.

213232109 is a deficient number, since it is larger than the sum of its proper divisors (2259517).

213232109 is an frugal number, since it uses more digits than its factorization.

213232109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 213232109 is about 14602.4692774887. The cubic root of 213232109 is about 597.4261122547.

It can be divided in two parts, 21323 and 2109, that added together give a palindrome (23432).

The spelling of 213232109 in words is "two hundred thirteen million, two hundred thirty-two thousand, one hundred nine".