211422018 has 16 divisors (see below), whose sum is σ = 424454976. Its totient is φ = 70205520.

The previous prime is 211422011. The next prime is 211422019. The reversal of 211422018 is 810224112.

It is a junction number, because it is equal to n+sod(n) for n = 211421985 and 211422003.

It is not an unprimeable number, because it can be changed into a prime (211422011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65413 + ... + 68568.

It is an arithmetic number, because the mean of its divisors is an integer number (26528436).

Almost surely, 2^211422018 is an apocalyptic number.

211422018 is an abundant number, since it is smaller than the sum of its proper divisors (213032958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211422018 is a wasteful number, since it uses less digits than its factorization.

211422018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134249.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 211422018 is about 14540.3582486815. The cubic root of 211422018 is about 595.7308233751.

The spelling of 211422018 in words is "two hundred eleven million, four hundred twenty-two thousand, eighteen".