213211109 has 4 divisors (see below), whose sum is σ = 213359904. Its totient is φ = 213062316.

The previous prime is 213211099. The next prime is 213211139. The reversal of 213211109 is 901112312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213211109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213211139) 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 3 ways as a sum of consecutive naturals, for example, 72227 + ... + 75120.

It is an arithmetic number, because the mean of its divisors is an integer number (53339976).

Almost surely, 2^213211109 is an apocalyptic number.

It is an amenable number.

213211109 is a deficient number, since it is larger than the sum of its proper divisors (148795).

213211109 is a wasteful number, since it uses less digits than its factorization.

213211109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148794.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 213211109 is about 14601.7502033147. The cubic root of 213211109 is about 597.4064992607.

The spelling of 213211109 in words is "two hundred thirteen million, two hundred eleven thousand, one hundred nine".