211122209 has 8 divisors (see below), whose sum is σ = 213385920. Its totient is φ = 208864656.

The previous prime is 211122157. The next prime is 211122211. The reversal of 211122209 is 902221112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211122209 - 2¹⁶ = 211056673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211122299) 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, 104402 + ... + 106404.

It is an arithmetic number, because the mean of its divisors is an integer number (26673240).

Almost surely, 2^211122209 is an apocalyptic number.

It is an amenable number.

211122209 is a deficient number, since it is larger than the sum of its proper divisors (2263711).

211122209 is a wasteful number, since it uses less digits than its factorization.

211122209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 211122209 is about 14530.0450446652. The cubic root of 211122209 is about 595.4490962478.

The spelling of 211122209 in words is "two hundred eleven million, one hundred twenty-two thousand, two hundred nine".