211222018 has 32 divisors (see below), whose sum is σ = 383201280. Its totient is φ = 85359120.

The previous prime is 211221979. The next prime is 211222019. The reversal of 211222018 is 810222112.

211222018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211222018² = 89229481775984648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221986 and 211222004.

It is not an unprimeable number, because it can be changed into a prime (211222019) 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, 18243 + ... + 27481.

It is an arithmetic number, because the mean of its divisors is an integer number (11975040).

Almost surely, 2^211222018 is an apocalyptic number.

211222018 is a deficient number, since it is larger than the sum of its proper divisors (171979262).

211222018 is a wasteful number, since it uses less digits than its factorization.

211222018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 211222018 is about 14533.4792118061. The cubic root of 211222018 is about 595.5429152356.

The spelling of 211222018 in words is "two hundred eleven million, two hundred twenty-two thousand, eighteen".