211122018 has 16 divisors (see below), whose sum is σ = 469160160. Its totient is φ = 70373988.

The previous prime is 211122013. The next prime is 211122047. The reversal of 211122018 is 810221112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (211122011) 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, 1954780 + ... + 1954887.

It is an arithmetic number, because the mean of its divisors is an integer number (29322510).

Almost surely, 2^211122018 is an apocalyptic number.

211122018 is an abundant number, since it is smaller than the sum of its proper divisors (258038142).

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

211122018 is a wasteful number, since it uses less digits than its factorization.

211122018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909678 (or 3909672 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 211122018 is about 14530.0384720757. The cubic root of 211122018 is about 595.4489166822.

The spelling of 211122018 in words is "two hundred eleven million, one hundred twenty-two thousand, eighteen".