212111009 has 16 divisors (see below), whose sum is σ = 237064320. Its totient is φ = 188160000.

The previous prime is 212110981. The next prime is 212111027. The reversal of 212111009 is 900111212.

It is a cyclic number.

It is not a de Polignac number, because 212111009 - 2¹² = 212106913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212111099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77537 + ... + 80225.

It is an arithmetic number, because the mean of its divisors is an integer number (14816520).

Almost surely, 2^212111009 is an apocalyptic number.

It is an amenable number.

212111009 is a deficient number, since it is larger than the sum of its proper divisors (24953311).

212111009 is a wasteful number, since it uses less digits than its factorization.

212111009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 212111009 is about 14564.0313443771. The cubic root of 212111009 is about 596.3772526003.

The spelling of 212111009 in words is "two hundred twelve million, one hundred eleven thousand, nine".